Un reason

unreason

[uhn-ree-zuhn]
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; Middle English un-reson. See un-1, reason

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World English Dictionary
unreason (ʌnˈriːzən)
 
n
1.  irrationality or madness
2.  something that lacks or is contrary to reason
3.  lack of order; chaos
 
vb
4.  (tr) to deprive of reason

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