noun
gaiety or indifference where seriousness and attention are called for
a crisis that allowed no room for lightness
Synonyms: flightiness, flippancy, frivolity, levity, light-mindedness, volatility
Related Word: buoyancy, effervescence, elasticity, expansiveness, resiliency; gaiety, liveliness, vivacity; cheerfulness, lightheartedness
Contrasted words: earnestness, gravity, sedateness, soberness, somberness, staidness
Antonyms: seriousness