sar ‧ don ‧ ic /sɑːˈdɒnɪk $ sɑːrˈdɑː-/ BrE AmE adjective written
[ Date: 1600-1700 ; Language: French ; Origin: sardonique , from Greek sardonios , from sardanios ; influenced by Sardonios 'Sardinian' , because of a plant from Sardinia (an Italian island) which causes the face to twist into a smile ]
showing that you do not have a good opinion of someone or something, and feel that you are better than them:
He looked at her with sardonic amusement.
—sardonically /-kli/ adverb