unreasoning

[uhn-ree-zuh-ning]
adjective
not reasoning or exercising reason; reasonless; thoughtless; irrational: an unreasoning fanatic.

Origin:
1745–55; un-1 + reasoning

unreasoningly, adverb
Dictionary.com Unabridged

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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To unreasoning
Collins
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

unreasoning (ʌnˈriːzənɪŋ)
 
adj
not controlled by reason; irrational
 
un'reasoningly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
When your laptop goes missing, your first reaction may be blind, unreasoning
  panic.
The board's unreasoning faith in the ability of a superstar leads them to offer
  huge rewards.
But anything was better than the old habit of unreasoning servility.
His terror of spiders was phobic--overwhelming and unreasoning--and it
  outlasted his fear of the darkness by several decades.
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