vitriolic (adj.)
- acerbic
- acid
- acidulous
- acrid
- acrimonious
- antagonistic
- antipathetic
- astringent
- belligerent
- biting
- bitter
- caustic
- clashing
- conflicting
- cutting
- despiteful
- double-edged
- edged
- fierce
- harsh
- hateful
- hostile
- incisive
- irritating
- keen
- malevolent
- malicious
- malignant
- mordacious
- mordant
- penetrating
- piercing
- piquant
- poignant
- pungent
- quarrelsome
- rancorous
- repugnant
- rigorous
- rough
- scathing
- severe
- sharp
- sore
- sour
- spiteful
- stabbing
- stinging
- strident
- stringent
- tart
- trenchant
- vehement
- venomous
- violent
- virulent
