Try Our Apps


Avoid these words. Seriously.


[ih-rash-uh-nal-i-tee] /ɪˌræʃ əˈnæl ɪ ti/
noun, plural irrationalities for 2.
the quality or condition of being irrational.
an irrational, illogical, or absurd action, thought, etc.
Origin of irrationality
First recorded in 1560-70; irrational + -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
Examples from the Web for irrationality
Contemporary Examples
Historical Examples
  • But machines could not hope to encompass all the irrationality of Man.

    Mezzerow Loves Company Floyd L. Wallace
  • Elsmere's irrationality was an aversion to doctors, from the point of view of his own ailments.

    Robert Elsmere Mrs. Humphry Ward
  • This is the fourth example of irrationality, or incommensurability.

    The Way To Geometry Peter Ramus
  • This is the fifth example of irrationality and incommensurability.

    The Way To Geometry Peter Ramus
  • The irrationality of the defence was a final proof that the lawyer had played him false.

    Gulmore, The Boss Frank Harris
British Dictionary definitions for irrationality


the state or quality of being irrational
irrational thought, action, or behaviour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for irrationality

1560s, from irrational + -ity.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source

Word of the Day

Nearby words for irrationality

Word Value for irrationality

Scrabble Words With Friends