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)agonistic, agonistical, combativestriving to overcome in argument“a dialectical and agonistic approach”