1) Aggressive 2) Bellicose 3) Belligerent 4) Bigerent 5) Tough 1) Belligerent 2) Combative 3) Hard-bitten 4) Hard-boiled 5) Quarrelsome 6) Ready and eager to fight 7) Tough 
• (a.) Disposed to fight; inclined to fighting; quarrelsome; fighting.
Pug·na'cious adjective [ Latin pugnax , -acis , from pugnare to fight. Confer Pugilism , Fist .] Disposed to fight; inclined to fighting; quarrelsome; fighting. -- Pug*na'cious*ly , adverb -- Pug*na'cious*ness , 
fond of in the habit of fighting 
[adj] - ready and able to resort to force or violence
pugnacious 1. Having a quarrelsome, combative disposition, belligerent. 2. An eagerness to fight or to argue issues instead of using calm consideration. 3. Ready and able to resort to force or violence. 4. Inclined to fight or to be aggressive.
rough adjective 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`
inclined to quarrel or fight readily; quarrelsome; belligerent; combative.
[SAT terms] ready and able to resort to force or violence