See more synonyms for unreasoning on Thesaurus.com

Origin of unreasoning

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


[uhn-ree-zuh n]
  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)
  1. to upset or disrupt the reason or sanity of: The devious plot soon unreasoned the general.

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


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


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