1) Cheek 2) Disrespect 3) Frivolousness 4) French word used in English 5) Impertinence 6) Levity 7) Lightness 8) Not serious or sensible 9) The trait of being frivolous 10) Trait Found on https://www.crosswordclues.com/clue/frivolity
Fri·vol'i·ty noun ; plural Frivolities . [ Cg. French frivolité . See Frivolous .] The condition or quality of being frivolous; also, acts or habits of trifling; unbecoming levity of disposition. Found on http://www.encyclo.co.uk/webster/F/78
the quality or state of being frivolous: the frivolity of Mardi Gras. · a frivolous act or thing: It was a frivolity he had a hard time living down. Found on https://www.infoplease.com/dictionary/frivolity