IRRATIONALLY Synonyms: 89 Similar and Opposite Words

irrational

adjective

i-ˈra-sh(ə-)nəl

as in unreasonable

not using or following good reasoning it's irrational to think that you can continue to consume an excess of calories and not gain weight

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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 irrational Silver’s encouragement had filled me with irrational confidence. —

Mckay Coppins, The Atlantic, 12 Mar. 2026 So was Odysseus’s response considered irrational and over-the-top to ancient Greeks? —

Nina Metz, Chicago Tribune, 9 Mar. 2026 Those models lack sound scientific basis and produce irrational results, such as requiring that nuclear plants protect against radiation below naturally occurring levels. —

Teri Sforza, Oc Register, 6 Mar. 2026 Photograph from Metropolitan Nashville Police Department / AP The pair would stay up late talking at Marone’s house, and when Friedmann got really candid something irrational and thrilling in him emerged. —

James Verini, New Yorker, 2 Mar. 2026 See All Example Sentences for irrational

Recent Examples of Synonyms for irrational

Adjective

As in Williams’ case, attorneys argued that a sweep had violated the plaintiffs’ Fourth Amendment rights protecting them from unreasonable search and seizure, as well as their 14th Amendment right to due process.

— Ariane Lange, Sacbee.com, 24 Mar. 2026
Because that is ultimately what The Secret Garden is about—the stubborn, almost unreasonable insistence of living things to grow toward the light.

— Literary Hub, Literary Hub, 23 Mar. 2026