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See more synonyms for unconscionable on Thesaurus.com
  1. not guided by conscience; unscrupulous.
  2. not in accordance with what is just or reasonable: unconscionable behavior.
  3. excessive; extortionate: an unconscionable profit.
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Origin of unconscionable

First recorded in 1555–65; un-1 + conscionable
Related formsun·con·scion·a·bil·i·ty, nounun·con·scion·a·bly, adverb


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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for unconscionable

Contemporary Examples

Historical Examples

  • It is unconscionable that Khalid should misappropriate Party funds.

    The Book of Khalid

    Ameen Rihani

  • They seemed to be taking an unconscionable time to get there.

  • Feasts in Fairyland occupy an unconscionable length of time.

    The Science of Fairy Tales

    Edwin Sidney Hartland

  • By the way, what an unconscionable lot of letters there must be to keep him in there all this time!

    My Friend Smith

    Talbot Baines Reed

  • He would have pitilessly repressed my unconscionable volubility.

    Faces in the Fire

    Frank W. Boreham

British Dictionary definitions for unconscionable


  1. unscrupulous or unprincipledan unconscionable liar
  2. immoderate or excessiveunconscionable demands
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Derived Formsunconscionableness, noununconscionably, adverb
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

Word Origin and History for unconscionable


1560s, "showing no regard for conscience," from un- (1) + now rare conscionable "conscientious." Related: Unconscionably.

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Online Etymology Dictionary, © 2010 Douglas Harper