ruth·less /ˈruθləs ||ˈrʊθ-/
  (a.)無情的,殘忍的,毫不留情的
  Ruth·less, a. Having no ruth; cruel; pitiless.
  Their rage the hostile bands restrain,
  All but the ruthless monarch of the main.   --Pope.
  -- Ruth*less*ly, adv. -- Ruth*less*ness, n.
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  ruthless
       adj : without mercy or pity; "an act of ruthless ferocity"; "a
             monster of remorseless cruelty" [syn: pitiless, remorseless,
              unpitying]