acrimonious (adj.)
- acerb
- acerbic
- acid
- acidic
- acidulent
- acidulous
- acrid
- astringent
- belligerent
- biting
- bitter
- burning
- caustic
- choleric
- contentious
- corrosive
- cranky
- cross
- cutting
- double-edged
- edged
- fierce
- harsh
- incisive
- indignant
- irascible
- irate
- ireful
- keen
- mad
- mordacious
- mordant
- penetrating
- piercing
- poignant
- quarrelsome
- rancorous
- resentful
- rigorous
- rough
- scathing
- scorching
- severe
- sharp
- sore
- splenetic
- stabbing
- stinging
- strident
- stringent
- tart
- testy
- trenchant
- vehement
- violent
- virulent
- vitriolic
- withering
- wrathful
- wroth
