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Definitions

irrational

[ih-rash-uh-nl, -rash-nl] / ɪˈræʃ ə nl, -ˈræʃ nl /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Peter Doomanis backed up Carpenter’s claims against Applegate and said that the man poses a serious “and escalating” threat to the singer, and has “developed a disturbing and irrational fixation” on the pop star.

From Los Angeles Times • Jun. 2, 2026

Macgregor had never known her old friend to be irrational.

From The Wall Street Journal • May 23, 2026

“I think that irrational exuberance that we saw in the dot com era … is just window dressing to cloak what, to me, is normalizing an addictive behavior in our society,” he said.

From MarketWatch • May 19, 2026

Quantum mania has become a staple of the tech sector, dismissed by some as irrational exuberance.

From Barron's • May 6, 2026

In their fascinating book Judgement under Uncertainty, Tversky and Kahneman describe a different variety of the seemingly irrational innumeracy that characterizes many of our most critical decisions.

From "Innumeracy: Mathematical Illiteracy and Its Consequences" by John Allen Paulos




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