contentious, combative, disputatious, disputative, litigious -- (inclined or showing an inclination to dispute or disagree, even to engage in law suits; "a style described as abrasive and contentious"; "a disputatious lawyer"; "a litigious and acrimonious spirit")
agonistic, agonistical, combative -- (striving to overcome in argument; "a dialectical and agonistic approach")
battleful, bellicose, combative -- (having or showing a ready disposition to fight; "bellicose young officers"; "a combative impulse"; "a contentious nature")
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