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1638, from Fr. sardonique (16c.), from L. sardonius (but as if from L. *sardonicus) in Sardonius risus, loan-translation of Gk. 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 (lit. "plant from Sardinia," see Sardinia) caused facial convulsions resembling those of sardonic laughter, usually followed by death. For nuances of usage, see humor.
Well that’s just unfair
6 days ago