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
That irrational choice, born of struggle and longing, changed my life.
—
Sudhir Gupta, Rolling Stone, 7 Oct. 2025
Isn’t there something inherently irrational about it?
—Lauren Michele Jackson, New Yorker, 5 Oct. 2025
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
See All Example Sentences for irrational
Sudhir Gupta, Rolling Stone, 7 Oct. 2025
Isn’t there something inherently irrational about it?
—Lauren Michele Jackson, New Yorker, 5 Oct. 2025
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
See All Example Sentences for irrational
Recent Examples of Synonyms for irrational
Adjective
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The letter came in response to a September argument from the CPSC that the launching of a new rule-compliant product undermined the argument that the rule was unreasonable.—
MSNBC Newsweek,
MSNBC Newsweek,
27 Oct. 2025
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This is not unreasonable in the least.—
R. Eric Thomas,
Mercury News,
26 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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Trump has accused Maduro of being an illegitimate president after an election that most independent observers believe was stolen.—
Richard Hall,
Time,
25 Oct. 2025
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Many of the campaigns have been more classic—for example, earlier this year, a wave of fake GitHub pages appeared for LastPass, with hackers using SEO tactics on Google and Bing to boost the illegitimate pages.—
PC Magazine,
PC Magazine,
25 Oct. 2025
Cite this Entry
“Irrational.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/irrational. Accessed 31 Oct. 2025.
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