Wiktionary
n. The quality of being sardonic
Wikipedia
Sardonicism is "the quality or state of being sardonic; an instance of this; a sardonic remark." A sardonic action is one that is "disdainfully or skeptically humorous" or "derisively mocking." Also, when referring to laughter or a smile, it is "bitter, scornful, mocking." Hence, when referring to a person or a personal attribute, it is "[c]haracterized by or exhibiting bitterness, scorn or mockery."
Usage examples of "sardonicism".
To enjoy Vance, you have to enjoy words as sculpture on paper, reality as a baroque landscape, and sardonicism for its own elegance.
He arched his brows, whether in surprise or sardonicism, till she gave him a tiny frown and headshake.
When one woman asks this question of another, it is ordinarily intended as an announcement of a property right, not a query, and the tone of voice ranges from subtle sardonicism to savage gloating.
There was a curious lurking sardonicism in the words, an undertone of mockery.