un·rea·son·ing

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

Origin:
1745–55; un-1 + reasoning

un·rea·son·ing·ly, adverb
Dictionary.com Unabridged

un·rea·son

[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. 2013.
Cite This Source Link To unreasoning
00:10
Unreasoning is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a stew of meat, vegetables, potatoes, etc.
Collins
World English Dictionary
unreason (ʌnˈriːzən) [Click for IPA pronunciation guide]
 
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) [Click for IPA pronunciation guide]
 
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
But unreasoning hostility is as inimical to understanding as blind deference.
Nevertheless, many of us continue to be concerned about the unreasoning
  viewpoint discrimination in science.
His terror of spiders was phobic--overwhelming and unreasoning--and it
  outlasted his fear of the darkness by several decades.
When your laptop goes missing, your first reaction may be blind, unreasoning
  panic.
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