illogical

il·log·i·cal

adjective \-ji-kəl\

Definition of ILLOGICAL

1

: not observing the principles of logic <an illogical argument>

2

: devoid of logic : senseless <illogical policies>

— il·log·i·cal·i·ty \-ˌlä-jə-ˈka-lə-tē\ noun

— il·log·i·cal·ly \-ˈlä-ji-k(ə-)lē\ adverb

— il·log·i·cal·ness \-kəl-nəs\ noun

Examples of ILLOGICAL

1. It is illogical to think that things will change on their own.
2. <the illogical claim that playing basketball makes people taller because one sees so many tall players>

First Known Use of ILLOGICAL

1588

Related to ILLOGICAL

Synonyms

fallacious, illegitimate, inconsequent, inconsequential, invalid, irrational, nonrational, unreasonable, unreasoning, unsound, weak

Antonyms

logical, rational, reasonable, sound, valid, well-founded, well-grounded

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

Other Logic Terms

a posteriori, connotation, corollary, inference, mutually exclusive, paradox, postulate, syllogism