If you describe someone as sardonic, you mean their attitude to people or things is humorous but rather critical. a big, sardonic man, who intimidated his students. showing that you do not have a good opinion of someone or something, and feel that you are better than them (sardonique, from sardonios, from sardanios; influenced by Sardonios , because of a plant from Sardinia (an Italian island) which causes the face to twist into a smile)
Forced; unnatural; insincere; hence, derisive, mocking, malignant, or bitterly sarcastic; applied only to a laugh, smile, or some facial semblance of gayety
disdainfully or ironically humorous; scornful and mocking; "his rebellion is the bitter, sardonic laughter of all great satirists"- Frank Schoenberner; "a wry pleasure to be reminded of all that one is missing"- Irwin Edman