bel\u2022lig\u2022er\u2022entPronunciation: (bu-lij\u0027ur-unt), [key] \u2014adj. 1. warlike; given to waging war. 2. of warlike character; aggressively hostile; bellicose: a belligerent tone. 3. waging war; engaged in war: a peace treaty between belligerent powers. 4. pertaining to war or to those engaged in war: belligerent rights. \u2014n. 1. a state or nation at war. 2. a member of the military forces of such a state.