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
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
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
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
-
Russia is trying to paint Ukraine as the unreasonable party in negotiations, Ferris said.—
Lauren Kent,
CNN Money,
12 Sep. 2025
-
Darryl Morin, national president of Forward Latino, a Latino advocacy group based in Franklin, Wisconsin, said the decision erodes Fourth Amendment protections against unreasonable search and seizure.—
Francesca Pica,
jsonline.com,
9 Sep. 2025
Adjective
-
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
-
The play’s serious depiction of class politics and illegitimate birth were considered shocking by contemporary audiences.—
Emily Zarevich,
JSTOR Daily,
11 Sep. 2025
-
After the death of Stebbins (Garrett Wareing), the Major’s illegitimate son, Ray and Pete are the only Long Walkers left.—
Louis Peitzman,
Vulture,
11 Sep. 2025
Cite this Entry
“Irrational.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/irrational. Accessed 18 Sep. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share