sardonic

Sardonic refers to a plant from Sardinia which was believed to cause anyone who ate it to laugh convulsively and then die.

: disdainfully or skeptically humorous : derisively mocking

Synonyms:

acerbic, acid, acrimonious, arrogant, austere, backhanded, bitchy, biting, bitter, brusque, captious, carping, caustic, chaffing, contemptuous, contumelious, corrosive, crack, cussed, cutting, cynical, derisive, disillusioned, disparaging, disrespectful, evil, hostile, irascible, ironical, mean, mocking, mordant, needle, offensive, ornery, salty, sardonic, satirical, saucy, scorching, scornful, scurrilous, severe, sharp, smart alecky, snarling, sneering, taunting, trenchant