Synonyms and Antonyms of unreasonable
1
having no basis in reason or fact
- an unreasonable assumption
illogical, irrational, nonlogical, unconscionable, unsound
fallacious, false, misled, wrong
gratuitous, uncalled-for, unnecessary
flimsy, implausible, misleading, specious, unconvincing, untenable, weak
ill-advised, unreasoned
inconsistent
absurd, asinine, brainless, crackpot, crazy, fatuous, foolish, half-witted, harebrained, meaningless, nonsensical, preposterous, senseless, silly, simpleminded, stupid, unwise
insane, lunatic, mad, nutty, wacky (also whacky)
certified, validated, verified
confirmed, corroborated
informed, logical, rational
commonsense, sane, sensible, sober, wise
actual, genuine, real, true
certain, sure
clear, cogent, compelling, convincing, credible, persuasive, plausible, satisfying, solid, sound
2
not using or following good reasoning
- an unreasonable respect for a man who did not deserve it
fallacious, illegitimate, illogical, inconsequent, inconsequential, invalid, irrational, nonrational, unreasoning, unsound, weak
eristic (also eristical), misleading, sophistic (or sophistical), specious
half-baked, ill-advised, misguided, unconsidered, unreasoned
inconsistent
absurd, asinine, foolish, meaningless, nonsensical, preposterous, reasonless, senseless, silly
Kafkaesque, odd, peculiar, strange, surreal, unusual, weird
insane, mad, nutty, wacky (also whacky)
disordered, disorganized, rambling, random
unconvincing
inexplicable, unaccountable, unexplainable
commonsense, sane, sensible, sober, wise
enlightened, informed, just, justified, reasoned
ordered, organized
clear, cogent, compelling, convincing, credible, persuasive, plausible, satisfying, solid
