Jun 172012
Page: 14
They also accused her of being sardonic, and although there was uncertainty about the meaning of the word, they knew that it was not a desirable quality in a woman, being one which gentlemen particularly disliked.
Word: sardonic
sar·don·ic /särdänik/ Adjective: Grimly mocking or cynical.
Synonyms: sarcastic

A sardonic laugh or sardonic grin would seem to have the intention of letting the other party know that the joke is on them.