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Adjective: pugnacious  ,púg'ney-shus
  1. Tough and callous by virtue of experience
    "The pugnacious politician seeks relief from his everyday battles";
    - hard-bitten, hard-boiled
  2. Ready and able to resort to force or violence
    "pugnacious spirits...lamented that there was so little prospect of an exhilarating disturbance";
    - rough

See also: aggressive, tough