"disputative" in the adjective sense
1. 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"
Source: WordNet® (An amazing lexical database of English)
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