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unreason

[uhn-ree-zuh n] /ʌnˈri zən/
noun
1.
inability or unwillingness to think or act rationally, reasonably, or sensibly; irrationality.
2.
lack of reason or sanity; madness; confusion; disorder; chaos:
a world torn by unreason.
verb (used with object)
3.
to upset or disrupt the reason or sanity of:
The devious plot soon unreasoned the general.
Origin
1250-1300
1250-1300; Middle English un-reson. See un-1, reason
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un reason

unreason

/ʌnˈriːzən/
noun
1.
irrationality or madness
2.
something that lacks or is contrary to reason
3.
lack of order; chaos
verb
4.
(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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