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")
contentious -- (involving or likely to cause controversy; "a central and contentious element of the book"- Tim W.Ferfuson)
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