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frivolous

[ˈfrɪvələ]

adj. (of people or their behaviour) silly or funny, especially when such behaviour is not suitable; having no useful or serious purpose

Adults having a pillow fight instead of attending a meeting

The judge dismissed the frivolous lawsuit.

"Girls Just Want to Have Fun" by Cyndi Lauper

The song celebrates frivolous, carefree fun without serious responsibility.

serious