combative

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"

striving to overcome in argument; "a dialectical and agonistic approach"

having or showing a ready disposition to fight; "bellicose young officers"; "a combative impulse"; "a contentious nature"