n. The condition or quality of being frivolous or trifling; insignificance.n. The act or habit of trifling; unbecoming levity of mind or disposition.n. Synonyms Lightness, Volatility, etc. (see levity) ; triviality, puerility, trifling. Frivolity, Frivolousness. Frivolity of character or conduct; frivolousness of an excuse, a pretext, an argument.