Frivolity (noun)

1. The quality of being lighthearted and not serious.
2. Something that is not important or lacks significance.

Origin:

Middle english, from middle french, from latin frivolous, from frivolus trifling, from frivus trifle.

Examples:

1. The party was filled with frivolity and laughter.
2. The conversation was filled with frivolity and not much substance.
3. He accused her of frivolous spending on unnecessary items.
4. The movie was criticized for its frivolous plot.
5. Critics felt that the play was too frivolous and lacked depth.