A disrespectful levity or pertness especially in respect to grave or sacred matters.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "flippancy" in a sentence
"As Schwiebert once quietly complained to me, “a time in media when flippancy is substituted for genuine knowledge.”"
"Part of it, if I may be excused a moment of flippancy, is that they are doing such a good job of making fools of themselves (and sometimes of Tolkien) that I see no reason to add my own meed of incapacity."
"But behind his flippancy was a certain grim disquiet: who or what had incited this magic sword to slay him?"