truculent (adj.)
- abrupt
- aggressive
- animal
- antagonistic
- anthropophagous
- atrocious
- bad-tempered
- barbaric
- barbarous
- bearish
- beastly
- bellicose
- belligerent
- bestial
- bloodthirsty
- bloody
- bloody-minded
- bluff
- blunt
- brash
- brusque
- brutal
- brute
- brutish
- bullying
- cannibalistic
- cavalier
- chauvinistic
- churlish
- combative
- contentious
- contumelious
- cruel
- crusty
- curt
- demoniac
- demoniacal
- devilish
- diabolic
- fell
- feral
- ferocious
- fiendish
- fierce
- fighting
- frightening
- grim
- gruff
- harsh
- hawkish
- hellish
- hostile
- ill-tempered
- infernal
- inhuman
- inhumane
- inimical
- intimidating
- jingoistic
- martial
- militant
- militaristic
- military
- murderous
- nasty
- obstreperous
- offensive
- opprobrious
- pugnacious
- quarrelsome
- rough
- rude
- ruthless
- sadistic
- sanguinary
- sanguineous
- satanic
- savage
- scathing
- scrappy
- scurrilous
- severe
- sharp
- short
- soldierlike
- soldierly
- subhuman
- sullen
- surly
- terrifying
- trigger-happy
- unchristian
- uncivilized
- unfriendly
- unhuman
- unpeaceable
- unpeaceful
- unpleasant
- vicious
- violent
- virulent
- vituperative
- warlike
- warring
- wolfish
