not guided by conscience; unscrupulous.
not in accordance with what is just or reasonable: unconscionable behavior.
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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unconscionable

Contemporary Examples of unconscionable

Historical Examples of unconscionable

  • 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



unscrupulous or unprincipledan unconscionable liar
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 unconscionable

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

Online Etymology Dictionary, © 2010 Douglas Harper