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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Recent Examples of irrational
This question becomes thornier once Dorotea visits Rocca in prison, finding her rude and abrasive though not irrational.
—
David Rooney, HollywoodReporter, 27 Aug. 2025
Over the years, mathematicians chipped away at it, proving the conjecture for certain irrational values of alpha (but not all).
—Lyndie Chiou, Quanta Magazine, 25 Aug. 2025
The similarity could be called what people have called in the past irrational exuberance.
—Nino Paoli, Fortune, 21 Aug. 2025
For years men have blamed divorce on menopause and said women are irritable and irrational, says Alyx Coble-Frake, founder of The Agenda, an app that helps women track their menstrual cycle to help increase productivity.
—Laura Trujillo, USA Today, 14 Aug. 2025
See All Example Sentences for irrational
David Rooney, HollywoodReporter, 27 Aug. 2025
Over the years, mathematicians chipped away at it, proving the conjecture for certain irrational values of alpha (but not all).
—Lyndie Chiou, Quanta Magazine, 25 Aug. 2025
The similarity could be called what people have called in the past irrational exuberance.
—Nino Paoli, Fortune, 21 Aug. 2025
For years men have blamed divorce on menopause and said women are irritable and irrational, says Alyx Coble-Frake, founder of The Agenda, an app that helps women track their menstrual cycle to help increase productivity.
—Laura Trujillo, USA Today, 14 Aug. 2025
See All Example Sentences for irrational
Recent Examples of Synonyms for irrational
Adjective
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We're protected from unreasonable searches and seizures.—
Adeola Adeosun,
MSNBC Newsweek,
9 Sep. 2025
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This is a crude and unreasonable attempt to make the discussion into an all-or-nothing affair.—
Lance Eliot,
Forbes.com,
7 Sep. 2025
Adjective
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Let sound political prescience but take the place of an unreasoning prejudice, and this will be done.—
Frederick Douglass,
The Atlantic,
16 Aug. 2017
Adjective
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Dumas’ injunction states that any decisions made in meetings with Weatherington claiming the chair seat are illegitimate.—
Raisa Habersham,
Miami Herald,
8 Sep. 2025
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Putin asked, reiterating a common Russian argument that their country sees the Ukrainian leader as illegitimate.—
Tara Suter,
The Hill,
4 Sep. 2025
Cite this Entry
“Irrational.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/irrational. Accessed 12 Sep. 2025.
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