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unreasoning

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

First recorded in 1745–55; un-1 + reasoning
Related formsun·rea·son·ing·ly, adverb

unreason

[uhn-ree-zuh n]
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.
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verb (used with object)
  1. to upset or disrupt the reason or sanity of: The devious plot soon unreasoned the general.
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Origin of unreason

First recorded in 1250–1300, unreason is from the Middle English word un-reson. See un-1, reason
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for unreasoning

unreasoning

adjective
  1. not controlled by reason; irrational
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Derived Formsunreasoningly, adverb

unreason

noun
  1. irrationality or madness
  2. something that lacks or is contrary to reason
  3. lack of order; chaos
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verb
  1. (tr) to deprive of reason
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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