Synonyms and Antonyms of reasonable
1 according to the rules of logic <his answer is perfectly reasonable> Synonyms analytic (or analytical), coherent, consequent, good, rational, logical, sensible, sound, valid, well-founded, well-groundedRelated Words a posteriori, a priori, syllogistic; cognitive, empirical (also empiric); defendable, defensible, justifiable, maintainable, supportable, sustainable, tenableNear Antonyms casuistic (or casuistical), eristic (also eristical), fallacious, misleading, sophistic (or sophistical), specious; unarticulated; unscientific; absurd, cockeyed, crazy, daffy, fatuous, half-baked, half-witted, harebrained, insane, loony (also looney), mad, nonsensical, nutty, preposterous, simpleminded, stupid, weak-minded, witless; senseless, thoughtless; uncompelling, unconvincingAntonyms illegitimate, illogical, incoherent, inconsequent, inconsequential, invalid, irrational, unreasonable, unsound, weak
2 based on sound reasoning or information <those playing rules sound reasonable to me> Synonyms commonsense, commonsensible, commonsensical, firm, hard, informed, just, justified, levelheaded, logical, rational, good, reasoned, sensible, sober, solid, valid, well-foundedRelated Words actual, real, true; certain, sure; certified, validated, verified; confirmed, corroborated, substantiated; cogent, convincing; colorable, credible, plausibleNear Antonyms unsubstantiated, unsupported, unwarranted; flimsy, implausible, unconvincing, weak; fallacious, false, misguided, misledAntonyms groundless, illogical, invalid, irrational, nonrational, nonsensical, nonvalid, unfounded, uninformed, unjustified, unreasonable, unreasoned, unsound
3 costing little <desperately trying to find reasonable hotel rates for the holiday weekend> Synonyms affordable, bargain-basement, budget, cheapie, cheapo, chintzy, cut-price [chiefly British], cut-rate, dime-store, dirt cheap, el cheapo, inexpensive, low, low-end, popular, cheapRelated Words cheapish, moderate; discount, discounted, fire-sale, lowered, reduced; wholesale; valueless, worthless; supercheap, ultracheapNear Antonyms increased, inflated; exorbitant, extravagant, overpriced, prohibitive, prohibitory, steep, stiff, superexpensive, ultraexpensive, unreasonable; invaluable, priceless; luxuriousAntonyms costly, dear, deluxe, expensive, high, high-ticket, precious, premium, pricey (also pricy), spendy [chiefly Northwest], valuable
4 having the ability to reason <some people once believed that women were not by nature reasonable beings, but generations of female scholars have proved those people wrong> Synonyms intelligent, rational, reasoning, thinkingRelated Words analytic (or analytical), logical; brainy, cerebral, highbrow, highbrowed, intellectual; cognitional, cognitive, mental; levelheaded, practical, sane, sensible, soberNear Antonyms brainless, dense, doltish, dopey (also dopy), dorky [slang], dull, dumb, fatuous, half-witted, mindless, obtuse, senseless, slow, stupid, thickheaded; fallacious, groundless, illogical, invalid, nonsensicalAntonyms irrational, nonrational, nonthinking, unintelligent, unreasonable, unreasoning, unthinking
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