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• s  lacking a conscience
  a conscienceless villain
  brash, unprincipled, and conscienceless

• unconscionable

Quotes

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• Stefan Zweig in Wall Street Journal
  I had recognized,Zweig wrote, "the foe I was to fight -- false heroism that prefers to send others to suffering and death, the cheap optimism of the conscienceless prophets, both political and military who, boldly promising victory,...
• Ann Rule in News-Reporter
  With every book I write,Rule said, "I realize more and more how many lives are affected by one cruel and conscienceless person who decides to take another human being's life."