the.com/belligerent

means Hostile and aggressive, openly eager to argue or fight rather than cooperate.

from From Latin belligerare, 'to wage war' — built from bellum ('war') and gerere ('to carry on, to wage'). The same bellum root gives us 'bellicose' and shows up fossilized in 'rebel' (one who wages war again). By the 1800s English had drafted 'belligerent' into diplomatic language for nations formally at war, before it marched into everyday speech for anyone just itching to throw a punch.