Source : Webster's Revised Unabridged Dictionary (1913)

Combative \Com"bat*ive\ (? or ?), a.
   Disposed to engage in combat; pugnacious.

Source : WordNet®

combative
     adj 1: striving to overcome in argument; "a dialectical and
            agonistic approach" [syn: {agonistic}, {agonistical}]
     2: having or showing a ready disposition to fight; "bellicose
        young officers"; "a combative impulse"; "a contentious
        nature" [syn: {battleful}, {bellicose}, {contentious}]