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[uhn-ree-zuh n] /ʌnˈri zən/
inability or unwillingness to think or act rationally, reasonably, or sensibly; irrationality.
lack of reason or sanity; madness; confusion; disorder; chaos:
a world torn by unreason.
verb (used with object)
to upset or disrupt the reason or sanity of:
The devious plot soon unreasoned the general.
Origin of unreason
1250-1300; Middle English un-reson. See un-1, reason Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for unreason
Contemporary Examples
Historical Examples
  • The more he believes in his own reason, the more he yearns for some method of out-shouting the unreason of his neighbours.

    God and Mr. Wells William Archer
  • The unreserve and unreason of her passion at last disgusted him.

    A Spoil of Office Hamlin Garland
  • The greatest theologians contributed to the welter of unreason from which this pseudo-science was developed.

  • It was typical of the unreason of his sex that he failed to be impressed by this argument.

    A Modern Chronicle, Complete Winston Churchill
  • I gave up reason; I surrendered myself to unreason; it is a not unpleasant process, occasionally.

    When the World Shook H. Rider Haggard
  • It was almost hysteria, to such a pitch of unreason was she wrought.

    Demos George Gissing
  • There were not only doubt and denial, but now there were also impatience and unreason.

    Soul of a Bishop H. G. Wells
British Dictionary definitions for unreason


irrationality or madness
something that lacks or is contrary to reason
lack of order; chaos
(transitive) to deprive of reason
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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