illogical

not using or following good reasoning the illogical claim that playing basketball makes people taller because one sees so many tall players illogical people are likely to believe every sensational claim made on TV Synonyms fallacious, illegitimate, inconsequent, inconsequential, invalid, irrational, nonrational, unreasonable, unreasoning, unsound, weak Related Words 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 Near Antonyms commonsense, sane, sensible, sober, wise; enlightened, informed, just, justified, reasoned; ordered, organized; clear, cogent, compelling, convincing, credible, persuasive, plausible, satisfying, solid; certain, sure, true; confirmed, corroborated, demonstrated, established, substantiated, validated Antonyms logical, rational, reasonable, sound, valid, well-founded, well-grounded