/ ˈfrɪvələs; NAmE / adjective ( disapproving )
1.
( of people or their behaviour ) silly or amusing, especially when such behaviour is not suitable :
frivolous comments / suggestions
Sorry, I was being frivolous.
2.
having no useful or serious purpose :
frivolous pastimes / pleasures
► frivo·lous·ly adverb
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WORD ORIGIN
late Middle English : from Latin frivolus silly, trifling + -ous .