ETYM French sardonique, Latin sardonius, Greek sardonios, perhaps from Greek, to grin like a dog, or from a certain plant of Sardinia, Greek, which was said to screw up the face of the eater.
Disdainfully or ironically humorous; scornful and mocking; SYN. wry.
Bitterly or evilly humorous; grimly mocking.

In a sardonic manner.