Balanced Antonyms

When programming, it's a pleasing coincidence when two variable names have the same number of letters - causing the code to line up. Often, you need to use variables that are antonyms. For example:

I wrote a short script to find antonyms with the same number of letters.

'Anglophilia', 'Anglophobia'
'CISC', 'RISC'
'Hindu_numeral', 'Roman_numeral'
'Lady', 'Lord'
'abaxial', 'adaxial'
'abaxial', 'ventral'
'abaxially', 'adaxially'
'abducent', 'adducent'
'abduct', 'adduct'
'abience', 'adience'
'abient', 'adient'
'above', 'below'
'abranchial', 'branchiate'
'abruptness', 'gentleness'
'absolute', 'relative'
'absorbable', 'adsorbable'
'abstain', 'consume'
'abstain', 'take_in'
'abstemious', 'gluttonous'
'abstract', 'concrete'
'abstractly', 'concretely'
'abstractness', 'concreteness'
'acanthopterygian', 'soft-finned_fish'
'acarpelous', 'carpellate'
'acarpelous', 'pistillate'
'acaudal', 'caudate'
'acaudate', 'caudated'
'accelerate', 'decelerate'
'acceleration', 'deceleration'
'accept', 'refuse'
'accept', 'reject'
'acceptive', 'rejective'
'accidentally', 'deliberately'
'acetify', 'sweeten'
'achromatic_color', 'chromatic_colour'
'acidify', 'sweeten'
'acropetal', 'basipetal'
'acroscopic', 'basiscopic'
'activator', 'inhibitor'
'activeness', 'inactivity'
'activity', 'inaction'
'adjective', 'essential'
'adscript', 'inferior'
'adscript', 'superior'
'advance', 'regress'
'advance', 'retreat'
'advantage', 'disfavour'
'adventuresome', 'unadventurous'
'advertently', 'unknowingly'
'advertently', 'unmindfully'
'advertently', 'unwittingly'
'aesthetical', 'inaesthetic'
'aestivate', 'hibernate'
'afebrile', 'feverish'
'afferent', 'efferent'
'afferent', 'motorial'
'affirm', 'negate'
'aggrade', 'degrade'
'agitate', 'quieten'
'agonist', 'opposer'
'air-to-surface', 'surface-to-air'
'allochthonous', 'autochthonous'
'allogamy', 'autogamy'
'allogeneic', 'xenogeneic'
'alphabetical', 'analphabetic'
'altricial', 'precocial'
'altruistic', 'egocentric'
'altruistic', 'egoistical'
'ambidextrous', 'right-handed'
'ametabolic', 'metabolous'
'anadromous', 'diadromous'
'anal', 'oral'
'anaphrodisiac', 'aphrodisiacal'
'anapsid', 'diapsid'
'anesthetize', 'bring_round'
'angular', 'rounded'
'antagonistic', 'conciliative'
'antagonistic', 'conciliatory'
'ante_up', 'default'
'antecede', 'postdate'
'antecedent', 'descendant'
'antecedent', 'subsequent'
'antedate', 'postdate'
'antemeridian', 'postmeridian'
'antemortem', 'postmortal'
'antemortem', 'postmortem'
'antenatal', 'perinatal'
'antenatal', 'postnatal'
'antenuptial', 'postnuptial'
'antonym', 'synonym'
'antonymous', 'synonymous'
'antrorse', 'retrorse'
'apocarpous', 'syncarpous'
'apparel', 'undress'
'appear', 'vanish'
'appreciate', 'depreciate'
'appreciate', 'undervalue'
'appreciation', 'depreciation'
'approbate', 'reprobate'
'aqueous', 'igneous'
'arouse', 'sedate'
'articulately', 'ineloquently'
'asperity', 'dullness'
'assail', 'defend'
'assemble', 'break_up'
'asynchronism', 'synchroneity'
'attach', 'detach'
'attachable', 'detachable'
'attached', 'detached'
'attack', 'defend'
'attend_to', 'leave_out'
'attend_to', 'pretermit'
'attract', 'repulse'
'attributable', 'unascribable'
'attributive', 'predicative'
'aunty', 'uncle'
'aurora', 'sunset'
'autogamic', 'exogamous'
'autogamous', 'endogamous'
'autologous', 'homologous'
'away', 'home'
'away_game', 'home_game'
'babble_out', 'keep_quiet'
'back', 'face'
'back', 'look'
'back', 'veer'
'background', 'foreground'
'backhand', 'forehand'
'backward', 'forwards'
'balefulness', 'beneficence'
'be_born', 'decease'
'be_born', 'pop_off'
'bear', 'bull'
'begin', 'cease'
'believability', 'incredibility'
'believable', 'incredible'
'believably', 'improbably'
'believably', 'incredibly'
'below', 'supra'
'belt_up', 'open_up'
'beneficence', 'maleficence'
'beneficent', 'maleficent'
'benevolence', 'malevolence'
'benevolently', 'malevolently'
'benign', 'malign'
'benignancy', 'malignance'
'benignancy', 'malignancy'
'benignity', 'malignity'
'beseeching', 'imperative'
'better', 'worsen'
'bettering', 'worsening'
'biennial', 'one-year'
'binaural', 'monaural'
'binaurally', 'in_one_ear'
'binaurally', 'monaurally'
'binaurally', 'to_one_ear'
'binucleate', 'trinuclear'
'binucleated', 'mononuclear'
'binucleated', 'trinucleate'
'birth', 'death'
'birth', 'dying'
'bivalved', 'univalve'
'black', 'white'
'blear', 'focus'
'bless', 'curse'
'blonde', 'brunet'
'blow_up', 'deflate'
'blunt_file', 'taper_file'
'bluntness', 'sharpness'
'boldness', 'timidity'
'bomb', 'pass'
'bottle-fed', 'breast-fed'
'bottlefeed', 'breastfeed'
'boycott', 'shop_at'
'boycott', 'sponsor'
'brachycephalic', 'dolichocranial'
'branch_out', 'specialise'
'branch_out', 'specialize'
'brave', 'timid'
'braveness', 'cowardice'
'break_down', 'synthesize'
'breathing', 'dyspnoeal'
'breathing', 'dyspnoeic'
'bright', 'dimmed'
'brighten', 'overcast'
'broad-mindedly', 'small-mindedly'
'broadnosed', 'catarrhine'
'bulging', 'concave'
'busy', 'idle'
'cacophonic', 'euphonious'
'caenogenesis', 'palingenesis'
'cainogenesis', 'palingenesis'
'calced', 'unshod'
'calcicolous', 'calcifugous'
'carelessly', 'cautiously'
'carnivorous', 'herbivorous'
'carvel-built', 'lap-streaked'
'catarrhine', 'leptorhine'
'catarrhine', 'platyrhine'
'cauline', 'radical'
'causative', 'noncausal'
'centrifugal', 'centripetal'
'centrifugal_force', 'centripetal_force'
'change', 'remain'
'changeableness', 'changelessness'
'changeableness', 'unchangingness'
'cheer', 'plain'
'cheer_up', 'complain'
'chirk_up', 'complain'
'cismontane', 'tramontane'
'civilian', 'military'
'claim', 'forgo'
'claim', 'waive'
'clam_up', 'open_up'
'clarity', 'opacity'
'clean', 'colly'
'clean', 'dirty'
'clean', 'grime'
'cleanness', 'dirtiness'
'clear_up', 'overcast'
'clearness', 'obscurity'
'clergyman', 'layperson'
'closed', 'opened'
'closeness', 'nakedness'
'closing', 'opening'
'cognisable', 'unknowable'
'cognizable', 'unknowable'
'cold-blooded', 'warm-blooded'
'coldhearted', 'warmhearted'
'color_in', 'discolor'
'colorise', 'discolor'
'colorize', 'discolor'
'colorless', 'colourful'
'come_on', 'regress'
'commit', 'divest'
'common', 'single'
'common_noun', 'proper_name'
'common_noun', 'proper_noun'
'competition', 'cooperation'
'complex_instruction_set_computer', 'reduced_instruction_set_computer'
'complex_instruction_set_computing', 'reduced_instruction_set_computing'
'complexity', 'simpleness'
'complexity', 'simplicity'
'con', 'pro'
'conductor', 'insulator'
'confidence', 'diffidence'
'confidence', 'self-doubt'
'confident', 'diffident'
'confine', 'release'
'confine', 'unloose'
'confined', 'invasive'
'conform', 'deviate'
'conform', 'diverge'
'conform_to', 'go_against'
'conjoin', 'disjoin'
'conjunct', 'disjunct'
'conjunctive', 'disjunctive'
'connectedness', 'disconnection'
'conscript', 'volunteer'
'consecrate', 'desecrated'
'conserve', 'squander'
'considerateness', 'inconsideration'
'considerateness', 'thoughtlessness'
'consistent', 'incoherent'
'consume', 'refrain'
'continuant_consonant', 'plosive_speech_sound'
'contraction', 'enlargement'
'cooking_apple', 'dessert_apple'
'cool', 'heat'
'cool', 'warm'
'correct', 'falsify'
'correctitude', 'improperness'
'courtesy', 'rudeness'
'crawl_in', 'turn_out'
'cursorial', 'fossorial'
'danger', 'safety'
'dead', 'live'
'deadly_sin', 'venial_sin'
'debark', 'embark'
'debarkation', 'embarkation'
'debilitating', 'invigorating'
'deciduous', 'evergreen'
'deciduous_plant', 'evergreen_plant'
'declination', 'improvement'
'decode', 'encode'
'decompress', 'pressurise'
'decompress', 'pressurize'
'decorated', 'unadorned'
'decrease', 'increase'
'decreased', 'increased'
'decreasing', 'increasing'
'decrement', 'increment'
'deductive', 'inductive'
'default', 'payment'
'defence', 'offence'
'defence', 'offense'
'defendant', 'plaintiff'
'defense', 'offence'
'defense', 'offense'
'defensive', 'offensive'
'defensively', 'offensively'
'deflate', 'inflate'
'deflation', 'inflation'
'deflationary', 'inflationary'
'deflationary_spiral', 'inflationary_spiral'
'deform', 'unbend'
'defrayment', 'nonpayment'
'degenerate', 'recuperate'
'dehumidify', 'moisturise'
'dehumidify', 'moisturize'
'delay', 'hurry'
'delete', 'record'
'deliberately', 'unexpectedly'
'demand', 'supply'
'demobilization', 'militarisation'
'demobilization', 'militarization'
'dependability', 'unreliability'
'dependable', 'unreliable'
'dependableness', 'unreliableness'
'dependably', 'unreliably'
'depersonalise', 'individualise'
'depersonalise', 'individualize'
'depersonalize', 'individualise'
'depersonalize', 'individualize'
'depress', 'lift_up'
'depress', 'pick_up'
'deregulate', 'regularise'
'deregulate', 'regularize'
'derivational', 'inflectional'
'descent', 'upgrade'
'desensitize', 'sensibilise'
'desensitize', 'sensibilize'
'destroyed', 'preserved'
'desynchronizing', 'synchronisation'
'desynchronizing', 'synchronization'
'dethrone', 'enthrone'
'diachronic', 'synchronic'
'difficulty', 'simpleness'
'difficulty', 'simplicity'
'digitigrade', 'plantigrade'
'digitigrade_mammal', 'plantigrade_mammal'
'diminish', 'increase'
'dine_in', 'eat_out'
'dioecious', 'monecious'
'dioecious', 'monoicous'
'diploid', 'haploid'
'diplomatical', 'undiplomatic'
'disarming', 'equipping'
'disassembly', 'fabrication'
'discharge', 'muster_in'
'discontinuous', 'uninterrupted'
'dishonest', 'honorable'
'dishonesty', 'honestness'
'disorient', 'orientate'
'dissuade', 'persuade'
'dissuasion', 'persuasion'
'dissuasive', 'persuasive'
'distal', 'mesial'
'distort', 'untwist'
'disunion', 'jointure'
'divest', 'invest'
'double', 'single'
'double-barreled', 'single-barreled'
'double-breasted', 'single-breasted'
'dove', 'hawk'
'downward', 'upwardly'
'draw', 'push'
'dress', 'strip'
'drop-off', 'increase'
'drunk', 'sober'
'dry', 'wet'
'dry-bulb_thermometer', 'wet-bulb_thermometer'
'dry_fly', 'wet_fly'
'dryness', 'wetness'
'dullness', 'keenness'
'dynamic', 'stative'
'dynamical', 'undynamic'
'early', 'later'
'east', 'west'
'easterly', 'westerly'
'eastern', 'western'
'easy', 'hard'
'ecdemic', 'endemic'
'ectomorphic', 'endomorphic'
'ectomorphic', 'mesomorphic'
'effector', 'receptor'
'efficacious', 'ineffective'
'efficaciously', 'ineffectively'
'efflux', 'inflow'
'efflux', 'influx'
'egoistic', 'selfless'
'elucidate', 'obfuscate'
'empirical', 'theoretic'
'employee', 'employer'
'end', 'get'
'ending', 'middle'
'endogamic', 'exogamous'
'endogenic', 'exogenous'
'endomorphic', 'mesomorphic'
'energetic', 'lethargic'
'enforce', 'relieve'
'enter', 'leave'
'entwine', 'untwine'
'erect', 'level'
'esoteric', 'exoteric'
'evasion', 'payment'
'everydayness', 'uncommonness'
'evil', 'good'
'evilness', 'goodness'
'ex_vivo', 'in_vivo'
'exaggerate', 'understate'
'exaugural', 'inaugural'
'excite', 'stifle'
'exclude', 'include'
'exclusion', 'inclusion'
'exclusive', 'inclusive'
'exculpatory', 'inculpative'
'exculpatory', 'inculpatory'
'exhale', 'inhale'
'existence', 'nonentity'
'expand', 'reduce'
'expand', 'shrink'
'expatriate', 'repatriate'
'expeditiously', 'inefficiently'
'experienced', 'inexperient'
'expire', 'inhale'
'explicit', 'implicit'
'explicitly', 'implicitly'
'explode', 'implode'
'export', 'import'
'extensive', 'intensive'
'exterior', 'interior'
'external', 'internal'
'externally', 'internally'
'extracellular', 'intracellular'
'extramural', 'intramural'
'extraversion', 'introversion'
'extraversive', 'introversive'
'extravert', 'introvert'
'extrinsic', 'intrinsic'
'extrospective', 'introspective'
'extroversion', 'introversion'
'extroversive', 'introversive'
'extroversive', 'introvertive'
'extrovert', 'introvert'
'extrusive', 'intrusive'
'fag_out', 'refresh'
'fail', 'pass'
'failing', 'passing'
'failure', 'success'
'faintheartedness', 'stoutheartedness'
'fair', 'foul'
'fair_ball', 'foul_ball'
'fairness', 'inequity'
'faithfully', 'unreliably'
'fall', 'lift'
'fall', 'rise'
'fall_back', 'get_ahead'
'falseness', 'sincerity'
'falsify', 'rectify'
'familiarity', 'strangeness'
'fancy', 'plain'
'fast', 'slow'
'fast_lane', 'slow_lane'
'father', 'mother'
'fatigue', 'refresh'
'fault', 'merit'
'fauna', 'flora'
'federal', 'unitary'
'fertile', 'sterile'
'fertility', 'sterility'
'figure', 'ground'
'find', 'lose'
'finiteness', 'infinitude'
'fire', 'hire'
'fit_out', 'undress'
'fixedness', 'looseness'
'flatten', 'sharpen'
'flatter', 'pick_at'
'flawlessness', 'imperfection'
'fogginess', 'sharpness'
'fold', 'open'
'foot', 'head'
'forbid', 'permit'
'foredate', 'postdate'
'forget', 'recall'
'forgetful', 'retentive'
'formalism', 'imitation'
'former', 'latter'
'forte', 'piano'
'fortissimo', 'pianissimo'
'fortunately', 'regrettably'
'forward', 'reverse'
'fraction', 'multiply'
'fraternal', 'identical'
'fraternal', 'monovular'
'fresh', 'salty'
'fresh', 'stale'
'freshness', 'staleness'
'frivolity', 'sincerity'
'full', 'thin'
'full', 'wane'
'full-term', 'premature'
'full-time', 'half-time'
'full-time', 'part-time'
'futurity', 'pastness'
'fuzziness', 'sharpness'
'gabled', 'hipped'
'gain', 'lose'
'gain', 'loss'
'gain', 'slim'
'gain', 'thin'
'garment', 'undress'
'garner', 'spread'
'gather', 'spread'
'general_agent', 'special_agent'
'general_verdict', 'special_verdict'
'generalist', 'specialist'
'generalize', 'specialise'
'generalize', 'specialize'
'generosity', 'stinginess'
'get-go', 'middle'
'get_out', 'pull_in'
'get_up', 'retire'
'give', 'take'
'gleefully', 'joylessly'
'go_for', 'refuse'
'good_humor', 'ill_humour'
'good_part', 'soft_spot'
'good_part', 'weak_part'
'good_part', 'weak_spot'
'grand_larceny', 'petit_larceny'
'grand_larceny', 'petty_larceny'
'hand-crafted', 'machine-made'
'haploidic', 'polyploid'
'hard', 'soft'
'hard_drug', 'soft_drug'
'hard_water', 'soft_water'
'hardball', 'softball'
'harden', 'soften'
'hardhearted', 'soft-boiled'
'hardhearted', 'softhearted'
'hardness', 'softness'
'hardware', 'software'
'hasten', 'linger'
'hate', 'love'
'hateful', 'lovable'
'have', 'lack'
'have', 'miss'
'head', 'rear'
'head', 'tail'
'hearten', 'put_off'
'heavily', 'lightly'
'heaviness', 'lightness'
'heavy', 'light'
'heavy-duty', 'light-duty'
'heavy-footed', 'light-footed'
'hide', 'show'
'high_tide', 'low_water'
'highlight', 'play_down'
'hire', 'sack'
'historical', 'synchronic'
'home_game', 'road_game'
'homochromatic', 'polychromatic'
'honor', 'shame'
'hop_out', 'jump_on'
'humaneness', 'inhumanity'
'humorless', 'humourous'
'hydrophilic', 'hydrophobic'
'hypercalcemia', 'hypocalcaemia'
'hyperglycemia', 'hypoglycaemia'
'hypertensive', 'normotensive'
'hyperthermy', 'hypothermia'
'hypervolemia', 'hypovolaemia'
'hypothyroidism', 'thyrotoxicosis'
'hypotonic', 'isosmotic'
'idle', 'work'
'ignite', 'quench'
'ignore', 'notice'
'ill-being', 'wellbeing'
'imitative', 'nonechoic'
'immaturity', 'matureness'
'immoderation', 'moderateness'
'immunocompetence', 'immunodeficiency'
'immunocompetent', 'immunodeficient'
'impartiality', 'partisanship'
'imprecision', 'preciseness'
'impurity', 'pureness'
'in_public', 'privately'
'incapability', 'potentiality'
'inclined', 'vertical'
'income', 'outlay'
'incoming', 'outgoing'
'inconsistently', 'systematically'
'independent', 'subordinate'
'indirectness', 'straightness'
'indoors', 'outside'
'inebriety', 'soberness'
'inessential', 'requirement'
'inexactly', 'precisely'
'inexcusably', 'justifiably'
'infamy', 'renown'
'inferior', 'superior'
'inferiority', 'superiority'
'infernal', 'supernal'
'inner', 'outer'
'insanity', 'saneness'
'insecure', 'unafraid'
'insensitivity', 'sensitiveness'
'inshore', 'seaward'
'insincerely', 'unfeignedly'
'integrate', 'segregate'
'integrated', 'segregated'
'integrating', 'segregation'
'integration', 'segregation'
'interdepartmental', 'intradepartmental'
'internality', 'outwardness'
'interred', 'unburied'
'interspecies', 'intraspecies'
'interstate', 'intrastate'
'intra_vires', 'ultra_vires'
'intractable', 'manipulable'
'intransitivity', 'transitiveness'
'involve', 'obviate'
'inwards', 'outward'
'irreparable', 'rectifiable'
'irresolution', 'resoluteness'
'jejunely', 'maturely'
'junior', 'senior'
'kainogenesis', 'palingenesis'
'keep', 'lose'
'keep_track', 'lose_track'
'kern', 'kern'
'kip_down', 'turn_out'
'large', 'small'
'largeness', 'smallness'
'laze', 'work'
'leaded_gasoline', 'unleaded_petrol'
'leaky', 'tight'
'lean', 'rich'
'leavened', 'unraised'
'lee_side', 'windward'
'leptorrhine', 'platyrrhine'
'less', 'more'
'let_go_of', 'take_hold'
'let_in', 'reject'
'let_out', 'take_in'
'level', 'raise'
'licking', 'victory'
'lie', 'sit'
'lie_down', 'stand_up'
'light_up', 'overcast'
'lighten_up', 'weigh_down'
'lightly', 'thickly'
'limpidity', 'obscurity'
'linear', 'planar'
'live_birth', 'stillbirth'
'live_out', 'sleep_in'
'loose', 'tight'
'looseness', 'tightness'
'losings', 'profits'
'loud', 'soft'
'loudly', 'softly'
'loudness', 'softness'
'low_quality', 'superiority'
'lower', 'raise'
'lower-class', 'upper-class'
'lowercase', 'majuscule'
'lowercase', 'uppercase'
'lucidness', 'obscurity'
'major', 'minor'
'major_surgery', 'minor_surgery'
'majority', 'minority'
'majuscule', 'minuscule'
'make', 'undo'
'make_it', 'succumb'
'manlike', 'unmanly'
'many-sided', 'unilateral'
'maternal', 'paternal'
'matriarchal', 'patriarchal'
'maxi', 'midi'
'maxi', 'mini'
'maximal', 'minimal'
'maximal', 'minimum'
'maximally', 'minimally'
'maximisation', 'minimization'
'maximise', 'minimise'
'maximise', 'minimize'
'maximization', 'minimisation'
'maximization', 'minimization'
'maximize', 'minimise'
'maximize', 'minimize'
'maximum', 'minimal'
'maximum', 'minimum'
'measurable', 'unmeasured'
'melodious', 'unmelodic'
'melodious', 'unmusical'
'mesic', 'xeric'
'metallic', 'nonmetal'
'middle', 'offset'
'middle', 'outset'
'midi', 'mini'
'minuscule', 'uppercase'
'monochromatic', 'polychromatic'
'monogamous', 'polygamous'
'mononuclear', 'trinucleate'
'monophonic', 'polyphonic'
'monophonic_music', 'polyphonic_music'
'monophony', 'polyphony'
'monoploid', 'polyploid'
'monosemy', 'polysemy'
'monotheism', 'polytheism'
'monotheistic', 'polytheistic'
'monovalent', 'polyvalent'
'mortal_sin', 'venial_sin'
'motorized', 'motorless'
'mouthless', 'stomatous'
'move', 'rest'
'move', 'stay'
'multiform', 'unvarying'
'nay', 'yea'
'negative', 'positive'
'negative_charge', 'positive_charge'
'negativeness', 'positiveness'
'negativism', 'positivity'
'negativity', 'positivism'
'negativity', 'positivity'
'new', 'old'
'newness', 'oldness'
'nidicolous', 'nidifugous'
'nod_off', 'wake_up'
'noisily', 'quietly'
'noisy', 'quiet'
'non-market_economy', 'private_enterprise'
'nonarboreal', 'tree-living'
'nonresonant', 'reverberant'
'north', 'south'
'northern', 'southern'
'northernness', 'southernness'
'object_program', 'source_program'
'obverse', 'reverse'
'obviate', 'require'
'oleophilic', 'oleophobic'
'one-piece', 'two-piece'
'open', 'shut'
'open_up', 'shut_up'
'ordinarily', 'remarkably'
'orientated', 'unoriented'
'ostentatious', 'unpretending'
'outwear', 'refresh'
'over-the-counter_drug', 'prescription_medicine'
'overclothe', 'underdress'
'overhand', 'underarm'
'overplay', 'underact'
'partly', 'wholly'
'passing', 'running'
'patronized', 'patronless'
'pellucidity', 'unclearness'
'penitentially', 'unrepentantly'
'perinatal', 'postnatal'
'permanent', 'temporary'
'permanently', 'temporarily'
'permissive', 'preventive'
'pigeon-toed', 'splayfooted'
'play_down', 'spotlight'
'playful', 'serious'
'ploughed', 'unplowed'
'poor', 'rich'
'poor_people', 'rich_people'
'porosity', 'solidity'
'precede', 'succeed'
'prefix', 'suffix'
'priestlike', 'unpriestly'
'probable', 'unlikely'
'processed', 'unrefined'
'productively', 'unprofitably'
'prophetical', 'unprophetic'
'prosecute', 'represent'
'provocative', 'unprovoking'
'publicised', 'suppressed'
'publicized', 'suppressed'
'pull', 'push'
'put_on', 'reduce'
'quickly', 'tardily'
'quiet', 'sound'
'quit', 'stay'
'raggedness', 'smoothness'
'raiment', 'undress'
'ravel', 'ravel'
'recall', 'supply'
'recto', 'verso'
'relax', 'tense'
'relaxing', 'restless'
'repeatable', 'unquotable'
'resistible', 'resistless'
'resolved', 'unsolved'
'rest_day', 'work_day'
'rh-negative', 'rh-positive'
'rhythmical', 'unrhythmic'
'ride', 'walk'
'right', 'wrong'
'rightfulness', 'wrongfulness'
'rightness', 'wrongness'
'rise', 'wane'
'rural', 'urban'
'rural_area', 'urban_area'
'sack_out', 'turn_out'
'salty', 'sweet'
'sanctitude', 'unholiness'
'secure', 'unsafe'
'sessile', 'stalked'
'sheared', 'unshorn'
'sick', 'well'
'sickness', 'wellness'
'significant', 'unimportant'
'similar', 'unalike'
'similitude', 'unlikeness'
'sink', 'swim'
'sit_down', 'stand_up'
'slug', 'work'
'soberness', 'tipsiness'
'source_program', 'target_program'
'speciality', 'weak_point'
'split', 'unite'
'stand', 'yield'
'stirred', 'unmoved'
'strain', 'unwind'
'strength', 'weakness'
'succumb', 'survive'
'summer_solstice', 'winter_solstice'
'summerise', 'winterize'
'summerize', 'winterise'
'summerize', 'winterize'
'summery', 'wintery'
'sundown', 'sunrise'
'surrender', 'withstand'
'sympathetic', 'unappealing'
'synthesize', 'take_apart'
'tame', 'wild'
'tameness', 'wildness'
'tangle', 'unknot'
'technophile', 'technophobe'
'tense', 'unlax'
'tense_up', 'unstrain'
'terseness', 'verbosity'
'thermoplastic', 'thermosetting'
'thoughtfully', 'unthinkingly'
'touched', 'unmoved'
'understandably', 'unintelligibly'
'undo', 'wrap'
'unerect', 'upright'
'vernal', 'wintry'
'waning', 'waxing'
'wetness', 'xerotes'