[ uhn-ree-zuh-ning ]
/ ʌnˈri zə nɪŋ /


not reasoning or exercising reason; reasonless; thoughtless; irrational: an unreasoning fanatic.

Nearby words

  1. unrealized,
  2. unreally,
  3. unreason,
  4. unreasonable,
  5. unreasonable behaviour,
  6. unreckonable,
  7. unrecognizable,
  8. unrecognized,
  9. unreconciled,
  10. unreconstructed

Origin of unreasoning

First recorded in 1745–55; un-1 + reasoning

Related formsun·rea·son·ing·ly, adverb


[ uhn-ree-zuh n ]
/ ʌnˈri zən /


inability or unwillingness to think or act rationally, reasonably, or sensibly; irrationality.
lack of reason or sanity; madness; confusion; disorder; chaos: a world torn by unreason.

verb (used with object)

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. 2019

Examples from the Web for unreasoning

British Dictionary definitions for unreasoning


/ (ʌnˈriːzənɪŋ) /


not controlled by reason; irrational
Derived Formsunreasoningly, adverb


/ (ʌnˈriːzən) /


irrationality or madness
something that lacks or is contrary to reason
lack of order; chaos


(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