noun

A nation or person engaged in war or conflict, as recognized by international law.

ships and goods captured at sea by a belligerent

militarist,hawk,jingoist,sabre-rattler,aggressor,provoker,belligerent

adjective

Hostile and aggressive.

the mood at the meeting was belligerent

hostile,aggressive,threatening,antagonistic,pugnacious,bellicose,truculent,confrontational,argumentative,quarrelsome,disputatious,contentious,militant,combative