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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Contumely sometimes falls on the unreason the vapidity, the garrulity of
  medieval discourses, and it is sometimes merited.
Rather than fight battles singly, he prefers all-out war on what he sees as
  unreason.
Both movements also swallowed an unhealthy dose of unreason.
Of course the variety of subjects that appeal to the unreason of such people is
  limitless.
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