Expressing harsh or sharp critisism in a clever way.
1) The pop star was surrounded by acerbic critics.
2) She whispered a stream of acerbic comments as the lecturer droned on.
French or Latin; from French acerbe, from Latin acerbus; akin to Latin acer which means 'sharp'.
sarcastic, acid, acidic, caustic, corrosive, snarky, smart-mouthed, cutting, sardonic
amusing, droll, merry, playful, urbane, good-humoured.