DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   ruthless
       adj 1: without mercy or pity; "an act of ruthless ferocity"; "a
              monster of remorseless cruelty" [syn: pitiless,
              remorseless, ruthless, unpitying]