acidulous (adj.)
- acerb
- acerbic
- acetic
- acetose
- acetous
- acid
- acidic
- acidulent
- acrid
- acrimonious
- astringent
- biting
- bitter
- burning
- caustic
- choleric
- corrosive
- cutting
- double-edged
- dry
- edged
- fierce
- harsh
- incisive
- keen
- mordacious
- mordant
- penetrating
- piercing
- piquant
- poignant
- pungent
- rancorous
- resentful
- rigorous
- rough
- scathing
- scorching
- severe
- sharp
- sore
- splenetic
- stabbing
- stinging
- strident
- stringent
- subacid
- tart
- trenchant
- vehement
- violent
- virulent
- vitriolic
- withering
