"contentious" 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"
2. contentious
involving or likely to cause controversy
"a central and contentious element of the book"- Tim W.Ferfuson
Source: WordNet® (An amazing lexical database of English)
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