Definition of: levity

(lev′ə·tē) noun
1. Lightness of humor or temperament; lack of mental gravity; want of seriousness or earnestness.
2. Frivolity; volatility; also, fickleness.
3. The state or quality of being light; especially, the quality of relative lightness.
4. A supposed tendency to rise in spite of gravity. [<L levitas, -tatis <levis light] Synonyms: flightiness, frivolity, giddiness, inconstancy, lightness, thoughtlessness, vanity. Antonyms: earnestness, gravity, seriousness, sobriety, steadiness, thoughtfulness.