ILLOGICAL Synonyms: 89 Similar and Opposite Words

illogical

adjective

(ˌ)i(l)-ˈlä-ji-kəl

as in unreasonable

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

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Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of illogical Link said there’s something illogical about ending widespread use of ExpressVote for early voting. —

Anthony Man, Sun Sentinel, 15 Feb. 2026 Contrary to Arya’s point, the current volatility may be seen as risk repricing under uncertainty, rather than as an illogical or paradoxical conclusion. —

Nick Lichtenberg, Fortune, 4 Feb. 2026 Saving constitutes such a huge, key chunk of life that spending can feel illogical and wrong. —

Steve Booren, Denver Post, 18 Jan. 2026 Indescribable, illogical, and oh-so powerful belief. —

Dieter Kurtenbach, Mercury News, 12 Jan. 2026 See All Example Sentences for illogical

Recent Examples of Synonyms for illogical

Adjective

Indeed, because deportation is not considered a criminal matter, the constitutional provisions protecting those accused and convicted of crimes do not apply, including prohibiting unreasonable searches and seizures, providing a lawyer and requiring a jury trial.

— Erwin Chemerinsky, Twin Cities, 8 Apr. 2026
That has prompted constitutional concerns around the Fourth Amendment, which prevents unreasonable search and seizure.

— Lisa Hagen, Hartford Courant, 7 Apr. 2026