• WordNet 3.6
    • adj conscienceless lacking a conscience "a conscienceless villain","brash, unprincipled, and conscienceless","an unconscionable liar"
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Webster's Revised Unabridged Dictionary
    • a Conscienceless Without conscience; indifferent to conscience; unscrupulous. "Conscienceless and wicked patrons."
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Century Dictionary and Cyclopedia
    • conscienceless Having no conscience; free from or not marked by conscientious scruples.
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In literature:

But all you natives are alike conscienceless, blind to the truth as if a curse from God was on you.
"The Valley of the Kings" by Marmaduke Pickthall
A conscienceless agitator you have never been.
"The Goose Man" by Jacob Wassermann
Mentally they were hard, efficient, ruthless, and conscienceless.
"The Airlords of Han" by Philip Francis Nowlan
The wound she had received from Philip had left her conscienceless towards Pete.
"The Manxman A Novel - 1895" by Hall Caine
For Lucy's conscienceless treatment of the male she had unmitigated contempt.
"Virginia" by Ellen Glasgow
He could not bring himself to regard her as being so absolutely conscienceless as the circumstances suggested.
"The Rider of Waroona" by Firth Scott
The American note was an indictment of Germany's conscienceless practices and broken faith.
"The Story of the Great War, Volume V (of 8)"
It was a test of brutality and consciencelessness.
"In the Shadow of the Hills" by George C. Shedd
Ah, the trouble he will make for me because of my conscienceless agents!
"Astounding Stories, May, 1931" by Various
It's an outrage, and no one but a vile, conscienceless woman would do it.
"The "Genius"" by Theodore Dreiser
It was that conscienceless, ambitious, treacherous Stoutenburg!
"The Laughing Cavalier" by Baroness Orczy
What would such conscienceless men do to her if they found at the last moment she was responsible for their hopeless predicament?
"The Gray Mask" by Wadsworth Camp
Dorian Gray has not got a cool, calculating, conscienceless character at all.
"Oscar Wilde: Art and Morality"
A conscienceless mechanism as soulless as cold steel.
"The Men Who Wrought" by Ridgwell Cullum
It was gall to the conscienceless junior to be thus baldly snubbed.
"Marjorie Dean, College Senior" by Pauline Lester
To my mind she is a conscienceless, hybrid creature.
"The Adventures of a Widow" by Edgar Fawcett
If I were a conscienceless wretch, now, it would be different!
"The Whirligig of Time" by Wayland Wells Williams
Therefore he who acts on anyone else's authority acts in a conscienceless manner.
"Morals and the Evolution of Man" by Max Simon Nordau
Nor is this philosophy of force either as conscienceless, as brutal, or as ruthless as its common statement would make it appear.
"The Great Illusion" by Norman Angell
And it is the prevailing consciencelessness, the universal lust to tyrannise, that really consummates the political dissolution.
"The Evolution of States" by J. M. Robertson