Demoniacal

sarcastic, demoniacal laughter

Rebecca laughed in her face, with a horrid sarcastic demoniacal laughter, that almost sent the schoolmistress into fits.

'What do you think of that, Job?' I asked of our retainer, who was sitting on the edge of the boat, trying to get as much sunshine as possible, and generally looking uncommonly wretched, and I pointed to the fiery and demoniacal head.

The spectator feels almost persuaded that he is witnessing some unearthly demoniacal orgie.