Levity means lightness of mind, a manner or expression with a lack of seriousness.
Levity is a noun.
Synonyms: flippancy, foolishness, silliness, triviality, frivolity, giddiness, jocularity.
Antonyms: sobriety, dignity, gravity, solemnity, seriousness, earnestness.
1. No one could explain how the magician was able to levitate the small baby elephant.
2. Mr. Ravi is not known for his levity; he is always grave and serious.
3. Your levity is not appreciated; this is an important issue we are discussing.