acrid (adj.)
- acerb
- acerbic
- acid
- acidic
- acidulent
- acidulous
- acrimonious
- acute
- antagonistic
- antipathetic
- astringent
- austere
- belligerent
- biting
- bitter
- caustic
- clashing
- cloying
- coarse
- conflicting
- corrosive
- cutting
- despiteful
- double-edged
- edged
- featheredged
- fierce
- fine
- hard
- harsh
- hateful
- hostile
- incisive
- irritating
- keen
- knifelike
- malevolent
- malicious
- malignant
- mordacious
- mordant
- penetrating
- piercing
- piquant
- poignant
- pungent
- quarrelsome
- rancorous
- repugnant
- rigorous
- rough
- saccharine
- scathing
- scorching
- set
- severe
- sharp
- sore
- sour
- spiteful
- stabbing
- stinging
- strident
- stringent
- tart
- trenchant
- vehement
- venomous
- violent
- virulent
- vitriolic
- withering
