Which word best describes a mockingly cynical attitude?

The term that best describes a mockingly cynical attitude is "sardonic." This word is used to characterize a kind of humor that is both witty and scornful, often conveying disdain or skepticism towards a certain subject. When someone adopts a sardonic tone, they might use irony or sarcasm to highlight the absurdities or shortcomings of people or situations, making it clear that they have a critical or contemptuous view.

In contrast, "rotund" refers to something that is rounded in shape or full-bodied, which does not relate to an attitude, let alone one that carries a mockingly cynical sentiment. "Salacious" pertains to something that is lewd or sexual in nature, indicating an interest in inappropriate or provocative matters, which is different from a cynical mockery. "Sepulcher," on the other hand, refers to a burial place, conveying a sense of death or mourning, and is not relevant to describing an attitude. Therefore, "sardonic" is the most fitting choice for describing a mockingly cynical attitude.