belligerent (n.)
- antagonist
 - ardent
 - battler
 - bickering
 - bitter
 - blade
 - bravo
 - brawler
 - bully
 - bullyboy
 - caustic
 - chauvinist
 - combatant
 - competitor
 - contender
 - contestant
 - disputant
 - duelist
 - enemy
 - enforcer
 - eristic
 - fencer
 - fighter
 - fighting
 - gamecock
 - gladiator
 - goon
 - gorilla
 - hawk
 - hood
 - hoodlum
 - hooligan
 - hostile
 - hot
 - jingo
 - jingoist
 - knight
 - martial
 - militant
 - military
 - offensive
 - partisan
 - plug-ugly
 - polemic
 - quarreler
 - rioter
 - rival
 - rough
 - rowdy
 - ruffian
 - savage
 - scrapper
 - sore
 - squabbler
 - strong-armer
 - struggler
 - swashbuckler
 - sword
 - swordsman
 - thug
 - tilter
 - tough
 - warmonger
 - warmongering
 - wrangler
 - wrangling
 
belligerent (adj.)
- acrid
 - aggressive
 - antagonistic
 - antipathetic
 - ardent
 - argumentative
 - attacking
 - bellicose
 - bitter
 - bloodthirsty
 - bloody
 - bloody-minded
 - bully
 - caustic
 - chauvinistic
 - clashing
 - combatant
 - combative
 - conflicting
 - contentious
 - controversial
 - despiteful
 - disputatious
 - divisive
 - eristic
 - factious
 - ferocious
 - fierce
 - fighting
 - hateful
 - hawkish
 - hostile
 - hot
 - inimical
 - invading
 - irascible
 - irritable
 - jingoistic
 - litigious
 - malevolent
 - malicious
 - malignant
 - martial
 - militant
 - militaristic
 - military
 - offensive
 - partisan
 - polemic
 - pugnacious
 - quarrelsome
 - rancorous
 - repugnant
 - rough
 - rowdy
 - sanguinary
 - sanguineous
 - savage
 - scrappy
 - shrewish
 - soldierlike
 - soldierly
 - sore
 - spiteful
 - tempered
 - tough
 - trigger-happy
 - truculent
 - unfriendly
 - unpeaceable
 - unpeaceful
 - venomous
 - virulent
 - vitriolic
 - warlike
 - warring
 
When my eyes shall be turned to behold for the last time the sun in heaven, may I not see him shining on the broken and dishonored fragments of a once glorious Union; on States dissevered, discordant, belligerent; on a land rent with civil feuds, or drenched, it may be, in fraternal blood.