Open English Wordnet
Adjectives
(s)contentious, combative, disputatious, disputative, litigiousinclined 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”
(s)contentiousinvolving or likely to cause controversy“a central and contentious element of the book” (Tim W.Ferfuson)