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
Jim Edwards InvestingMarkets Back in the ’90s a Fed chief warned about ‘irrational exuberance’ in the markets.
—
Geoff Colvin, Fortune, 30 Sep. 2025
Those poor scientists – their federal funding has been taken away, their research programs scrapped, and their rigorous scientific findings ignored in favor of one man’s irrational, uninformed opinion.
—Rafael Perez, Oc Register, 25 Sep. 2025
Consciousness, human life, utterly in the grip of its own dreamlife, all our thinking and voicing caught in a web of surreal distortion, generated by our irrational yearning and apprehensions, our appetite for myth, our solipsism.
—Jane Ciabattari
september 25, Literary Hub, 25 Sep. 2025
Still, Williams is quick to defend the character’s seemingly irrational actions, reminding us how Rain’s past experiences inform her present-day motivations.
—Andy Swift, TVLine, 20 Sep. 2025
See All Example Sentences for irrational
Geoff Colvin, Fortune, 30 Sep. 2025
Those poor scientists – their federal funding has been taken away, their research programs scrapped, and their rigorous scientific findings ignored in favor of one man’s irrational, uninformed opinion.
—Rafael Perez, Oc Register, 25 Sep. 2025
Consciousness, human life, utterly in the grip of its own dreamlife, all our thinking and voicing caught in a web of surreal distortion, generated by our irrational yearning and apprehensions, our appetite for myth, our solipsism.
—Jane Ciabattari
september 25, Literary Hub, 25 Sep. 2025
Still, Williams is quick to defend the character’s seemingly irrational actions, reminding us how Rain’s past experiences inform her present-day motivations.
—Andy Swift, TVLine, 20 Sep. 2025
See All Example Sentences for irrational
Recent Examples of Synonyms for irrational
Adjective
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Many of our technologies are built on the not-unreasonable assumption that openness is good, and that more common knowledge is better.—
Joshua Rothman,
New Yorker,
14 Oct. 2025
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Each side of the issue argues that the other is unreasonable and operating in bad faith.—
Taylor Seely,
AZCentral.com,
9 Oct. 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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Also endangering the family name and business is a crooked deal made by Byron Hedges (Jack Gleeson), an illegitimate cousin helping Guinness expand into America, that promises 15% of all American profits to the Fenian Brotherhood.—
Lynsey Eidell,
PEOPLE,
27 Sep. 2025
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The play’s serious depiction of class politics and illegitimate birth were considered shocking by contemporary audiences.—
Emily Zarevich,
JSTOR Daily,
11 Sep. 2025
Cite this Entry
“Irrational.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/irrational. Accessed 17 Oct. 2025.
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