ETYM Latin contentiosus: cf. French contentieux.
1. Inclined or showing an inclination to dispute or disagree, even to engage in law suits; SYN. disputatious, disputative, litigious.
2. Involving or likely to cause controversy.

1. Inclined to dispute
2. Marked by disputation
3. Provoking debate; controversial

ETYM Latin litigiosus, from litigium dispute, quarrel, from litigare: cf. French litigieux. Related to Litigation.
Of or relating to litigation.

Apt or disposed to quarrel; given to arguments and contention; easily irritated or provoked to argument.

Contentiously, quarrelsomely, disputatiously, combatively

Belligerently, argumentatively, competitively

In a disputatious manner; SYN. argumentatively.