See contentious in Webster's New World Roget's A-Z Thesaurus II
adjective
Given to arguing:
argumentative, combative, disputatious, eristic, litigious, polemic, polemical, quarrelsome, scrappy. See conflictHaving or showing an eagerness to fight:
bellicose, belligerent, combative, hostile, militant, pugnacious, quarrelsome, scrappy, truculent, warlike. See attackInclined to act in a hostile way:
aggressive, belligerent, combative, hostile, militant. See attack, attitude
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