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Adjective: unmerciful  ,ún'mur-si-ful
  1. Having or showing no mercy
    "the unmerciful enemy";
    - merciless

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