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  1. not guided by conscience; unscrupulous.
  2. not in accordance with what is just or reasonable: unconscionable behavior.
  3. excessive; extortionate: an unconscionable profit.

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

Synonyms for unconscionable

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

Examples from the Web for unconscionably

Historical Examples of unconscionably

British Dictionary definitions for unconscionably


  1. unscrupulous or unprincipledan unconscionable liar
  2. immoderate or excessiveunconscionable demands
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 unconscionably



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

Online Etymology Dictionary, © 2010 Douglas Harper