belligerent

(noun) someone who fights (or is fighting). Synonyms: combatant, battler, fighter, scrapper.

(adj) characteristic of an enemy or one eager to fight. Synonyms: aggressive. Examples: "Aggressive acts against another country." "A belligerent tone."

(adj) engaged in war. Synonyms: militant, war-ridden, warring. Example: "Belligerent (or warring) nations."