Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Absence or lack of reason; irrationality.
  • n. Nonsense; absurdity.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Lack of reason or rationality; unreasonableness; irrationality.
  • n. Nonsense; folly; absurdity.
  • v. To prove to be unreasonable; disprove by argument.

from the GNU version of the Collaborative International Dictionary of English

  • n. Want of reason; unreasonableness; absurdity.
  • transitive v. To undo, disprove, or refute by reasoning.

from The Century Dictionary and Cyclopedia

  • To prove to be unreasonable; disprove by argument.
  • n. Lack of reason; unreasonableness; irrationality; nonsense; folly; absurdity.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the state of being irrational; lacking powers of understanding

Etymologies

From un- +‎ reason. (Wiktionary)

Examples

  • Or again, the term unreason is sometimes used rather more reasonably; for a sort of loose or elliptical statement, which is at least illogical in form.

    G.K. Speaks - Reflections on a Rotten Apple

  • And anomalies accustom the mind to the idea of unreason and untruth.

    All Things Considered

  • For in the postmodern age of unreason, that is all that matters.

    Cranmer

  • Act then, my child, in conformity with justice and duty, regardless of any ulterior object, without considering whether your action will bring you pleasure or pain, without fear of the judgment of men or the envy of the gods, and you will win that peace of mind which distinguishes the wise from the unwise, and may be happy even in adverse circumstances; for the only real evil is the dominion of wickedness, that is to say the unreason which rebels against nature, and the only true happiness consists in the possession of virtue.

    The Sisters — Volume 3

  • Reason-Necessity pulling towards the lower, towards the unreason which is its own characteristic, while yet the Intellectual Principle remains sovereign over it.

    The Six Enneads.

  • “If I can only get there,” she kept saying to herself; and then, with that frantic unreason which is the chief characteristic of the instinct-driven mother: “I might have known that God would punish me for my unnatural conduct.

    Jennie Gerhardt

  • It is true that I think American alcohol laws are both idiotic and chaotic, and based on unreason.

    Is Hello Kitty wine the Joe Camel of wine? [poll] | Dr Vino's wine blog

  • Johann Hari: Republicans, religion and the triumph of unreason - Johann Hari, Commentators - The Independent

    Linkspam for 20-8-2009

  • The political credibility of the world's beacon of democracy has failed in the face of an insurgency of unreason.

    Britain must resist Tea Party thinking | Polly Toynbee

  • In the face of obdurate unreason, the president of hyper-reasonableness was forced to surrender.

    Britain must resist Tea Party thinking | Polly Toynbee

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