Sardonic
Etymology
From Greek sardonios, linked to Sardinia. Ancient writers described a "Sardinian plant" that supposedly made those who ate it convulse into a bitter, grinning rictus — the "sardonic" laugh. The etymology is old folklore, but the tone it names is exact.
adjective · /sar-DON-ik/
Grimly or scornfully mocking; bitterly humorous.
What it names
The dry, dark tone that laughs without warmth — humor with an edge of disdain.
Example
"Well, that went perfectly," she said, with a sardonic glance at the wreckage.
Related idea
Ironic says the opposite of what is meant; sardonic adds contempt on top.