irrationality
Americannoun
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the quality or condition of being irrational.
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an irrational, illogical, or absurd action, thought, etc.
noun
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the state or quality of being irrational
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irrational thought, action, or behaviour
Other Word Forms
Etymology
Origin of irrationality
First recorded in 1560–70; irrational + -ity
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.
Options remain the best way to monetize investor irrationality and emotional dysregulation.
From Barron's • Mar. 11, 2026
America's top banker Jamie Dimon, the chief executive of US bank JP Morgan, said he was worried, and Google boss Sundar Pichai told the BBC there was "irrationality" in the current AI boom.
From BBC • Jan. 10, 2026
At least one fellow, however, thought the addition represented a surrender to the forces of superstition and irrationality.
From The Wall Street Journal • Jan. 4, 2026
It’s simply a matter of taking advantage of structural market irrationality.
From MarketWatch • Dec. 26, 2025
In the back of my mind lingered an awareness of the hideous irrationality of this situation, but at the forefront, there was only blind terror.
From "The City Beautiful" by Aden Polydoros
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
