belligerent

Adjective

• engaged in war
  • belligerent (or warring) nations
    

• characteristic of an enemy or one eager to fight
  • aggressive acts against another country
    
  • a belligerent tone
    

Noun

• someone who fights (or is fighting)

Related words

• Synonyms: 
  militant , war-ridden , warring , aggressive , combatant , battler , fighter , scrapper