sar·don·ic 
(sär-dŏnĭk)
(sär-dŏnĭk)adj.
1. Scornfully or cynically mocking: a sardonic sense of humor.
2. Given to making sardonic remarks: "He was proud, sardonic, harsh to inferiority of every description" (Charlotte Brontë).
[French sardonique, from Greek sardonios, alteration of sardanios; perhaps akin to sesērenai, to show the teeth, grin mockingly.]
sar·doni·cal·ly adv.
sar·doni·cism (-ĭ-sĭz′əm) n.