What term is used to describe a scornfully mocking attitude?

The term "sardonic" specifically refers to a scornfully mocking or cynical attitude. It conveys a sense of derision or disdain, often through humor or wit that is cutting or sarcastic. This word has its roots in the Sardonic plant, which was believed to produce a painful grin, symbolizing the bitter laughter associated with mocking or cynical remarks.

In contrast, the other terms do not connote the same meaning. "Shellac" refers to a type of varnish used for finishing surfaces, while "shunt" is a term primarily used in electrical engineering or medicine to describe the diversion of something from one path to another. "Sepulcher," on the other hand, refers to a burial place or tomb, which has no connection to the concept of mockery or scorn. Thus, "sardonic" is the most fitting term to describe a scornfully mocking attitude.