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Adjective: merciless  mur-si-lus
  1. Having or showing no mercy
    "a merciless critic"; "gave him a merciless beating"; "the merciless enemy";
    - unmerciful

See also: bloody, bowelless, cutthroat, fierce, hard, implacable, inclement, mortal, pitiless, remorseless, ruthless, tigerish, uncompassionate, unkind, unpitying

Antonym: merciful

Encyclopedia: Merciless