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Synonyms for Belligerent (same or very similar meaning)

WordNet sense 1 (someone who fights (or is fighting)):
battler, combatant, fighter, scrapper

WordNet sense 2 (engaged in war):
fighting, militant, warring, war-ridden

WordNet sense 3 (not peaceful):
unpeaceful

WordNet sense 4 (characteristic of an enemy or one eager to fight):
aggressive

WordNet sense 5 (characterized by enmity or ill will):
hostile


From the ODE community, based on WordNetadd/edit