pugnacious in WordNet English dictionary

1. tough and callous by virtue of experience
   hard-bitten  hard-boiled  pugnacious 
   
2. ready and able to resort to force or violence
   "pugnacious spirits...lamented that there was so little prospect of an exhilarating disturbance"- Herman Melville; "they were rough and determined fighting men"
   pugnacious  rough