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[uhn-ree-zuh-nuh-buh l, -reez-nuh-] /ʌnˈri zə nə bəl, -ˈriz nə-/
not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational:
an unreasonable person.
not in accordance with practical realities, as attitude or behavior; inappropriate:
His Bohemianism was an unreasonable way of life for one so rich.
excessive, immoderate, or exorbitant; unconscionable:
an unreasonable price; unreasonable demands.
not having the faculty of reason.
Origin of unreasonable
First recorded in 1300-50, unreasonable is from the Middle English word unresonabel. See un-1, reasonable
Related forms
unreasonableness, noun
unreasonably, adverb
1, 2. senseless, foolish, silly. 2. preposterous, absurd, stupid, nonsensical. 3. extravagant. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for unreasonableness
Historical Examples
  • But the unreasonableness of such a suspicion was patent, and Mr Verloc held his tongue.

    The Secret Agent Joseph Conrad
  • What I had done I had done as much to win Roxalanne to me as to win her from her own unreasonableness.

    Bardelys the Magnificent Rafael Sabatini
  • It was Tom who pointed out the unreasonableness of emotion in making this demand.

  • Her wishes had none of the unreasonableness of dying fancies.

    Rene Mauperin

    Edmond de Goncourt and Jules de Goncourt
  • Thus he sat wondering, dismayed by the unreasonableness of women.

    The Dark Flower John Galsworthy
  • It shows clearly the unreasonableness of national sentiments.

  • And off went Sally, leaving her mother to reason with herself about her own unreasonableness.

    Somehow Good William de Morgan
  • Quite a common characteristic of sick people is unreasonableness.

  • Mr. Medway was astonished and shocked at the unreasonableness of his late rival.

    Little Bobtail Oliver Optic
  • Aware of the unreasonableness of this feeling, she yet had no wish to conquer it.

    The Gilded Man Clifford Smyth
British Dictionary definitions for unreasonableness


immoderate; excessive: unreasonable demands
refusing to listen to reason
lacking reason or judgment
Derived Forms
unreasonableness, noun
unreasonably, adverb
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
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Word Origin and History for unreasonableness



mid-14c., from un- (1) "not" + reasonable. Related: Unreasonably.

Online Etymology Dictionary, © 2010 Douglas Harper
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