1) Aggressive 2) Arguable 3) Argumentative 4) At odds 5) Battleful 6) Bellicose 7) Brigose 8) Controversial 9) Disputatious 10) Disputative 11) Dissentious 12) Quarrelsome 1) Argumentative 2) Disputatious 3) Disputative 4) Divisive 5) French word used in English 6) Litigious 7) Notorious 8) Tending to argument or strife 
• (a.) Contested; litigated; litigious; having power to decide controversy. • (a.) Relating to contention or strife; involving or characterized by contention. • (a.) Fond of contention; given to angry debate; provoking dispute or contention; quarrelsome.
Con·ten'tious adjective [ Latin contentiosus : confer French contentieux .] 1. Fond of contention; given to angry debate; provoking dispute or contention; quarrelsome. « Despotic and contentious temper. Macaulay. » 2. Relating to contention o...
argumentative pugnacious combative quarrelsome 
[adj] - inclined or showing an inclination to dispute or disagree, even to engage in law suits 2. [adj] - involving or likely to cause controversy
contentious 1. Always ready to argue; quarrelsome. 2. Of, involving, or characterized by dispute; controversial.
Modified Comet with hydraulic suspension and fixed mount 20-pdr [UK]
combative adjective 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`
tending to argument or strife; quarrelsome: a contentious crew. · causing, involving, or characterized by argument or controversy: contentious issues. · pertaining to causes between contending parties.
[Difficult words] involving or likely to cause controversy showing an inclination to disagree[Inspiring words] involving or likely to cause controversy