Argumentative, quarrelsome, ready and eager to argue, bicker, or debate.
→ Contentious, litigious, pugnacious, disputatious, belligerent, and bellicose all refer to quarrelsome or hostile parties who are inclined to engage in argument or conflict.
Bellicose (BEL-i-kohs) means having a warlike or hostile nature. The ancient Spartans were a bellicose people.
Belligerent (buh-LIJ-ur-int) may mean either participating in fighting or provoking a fight or a war. A belligerent nation either engages in conflict or provokes a conflict. A belligerent look or a belligerent remark can lead to a fight.
Pugnacious (puhg-NAY-shus, word 8 of Level 5) by derivation means ready to fight with the fists; it suggests a temperamental inclination to fight or quarrel: “As a child Melvin was unruly, as a teenager he was deviant, and as an adult he became a pugnacious barroom brawler.”
Disputatious (DIS-pyoo-TAY-shus) means inclined to dispute, and usually applies to people who engage in formal arguments or to anything involving formal debate. Scholars are often disputatious, and it goes without saying that politics is disputatious.
Litigious (li-TIJ-us) means tending to engage in lawsuits or litigation. Although it is entirely appropriate to say that the legal profession is litigious, meaning that its business is to engage in lawsuits, in current usage litigious often implies an overeagerness to settle every minor dispute in court.
Contentious (kun-TEN-shus) comes from the Latin contentio, striving, effort, and ultimately from contendere, to strain or strive against another. From the same source we inherit the verb to contend, to struggle, fight, strive in opposition, and the noun contention, which may mean either a struggle, opposition—“They were in contention for the job”—or an assertion made in an argument: “It was his contention that if the company wanted to remain solvent, it should truncate its workforce.”
The adjective contentious means always ready and willing to quarrel, and suggests a persistent inclination to pick fights or arguments. You can be in a contentious mood, meaning you are in an argumentative mood; you can have a contentious coworker, one who is quarrelsome; or you can make a contentious comment, one intended to provoke an argument.
Antonyms of contentious include peaceable, obliging, civil, tolerant, amiable, amicable (AM-i-kuh-buul), benevolent (buh-NEVuh-lent), equable (EK-wuh-buul), and forbearing (for-BAIR-ing).