capable of burning, corroding, or destroying living tissue.

severely critical or sarcastic

a caustic remark.

a caustic substance.

Optics .

caustic curve.

caustic surface.

adjective

calm , mild , soothing , kind , nice , unsarcastic

adjective

abrasive , acerbic , acid , acrid , alkaline , astringent , biting , corroding , erosive , keen , mordant , pungent , tart , acerb , acrimonious , bitter , cutting , harsh , incisive , pithy , rough , salty , satiric , scathing , severe , sharp , stinging , trenchant , virulent , acidic , corrosive , mordacious , slashing , truculent , vitriolic , acidulous , burning , catheretic , crisp , gnawing , ironic , lye , malevolent , sarcastic , satirical