sardonic (adj.) Look up sardonic at Dictionary.com
1630s, from French sardonique (16c.), from Latin sardonius (but as if from Latin *sardonicus) in Sardonius risus, loan-translation of Greek sardonios (gelos) "of bitter or scornful (laughter)," altered from Homeric sardanios (of uncertain origin) by influence of Sardonios "Sardinian," because the Greeks believed that eating a certain plant they called sardonion (literally "plant from Sardinia," see Sardinia) caused facial convulsions resembling those of sardonic laughter, usually followed by death. For nuances of usage, see humor. Related: Sardonically.