sardonic vs. sarcastic

sardonic vs. sarcastic: What's the difference?

Sardonic and sarcastic both describe someone or something derisive. Sardonic suggests something mocking or cynical. Sarcastic generally has a layer of irony, while sardonic doesn’t. Sarcastic is more often used to refer to speech or personality, as in She always makes such sarcastic jokes, while sardonic can describe more general things, as in a sardonic smile.