merciless
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mer·ci·less

adjective \ˈmər-si-ləs\

Definition of MERCILESS

: having or showing no mercy : pitiless
mer·ci·less·ly adverb
mer·ci·less·ness noun

Examples of MERCILESS

  1. the merciless killing of innocent people
  2. He has been merciless in his criticism of his opponent.

First Known Use of MERCILESS

14th century

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