Definition of frivolous adjective from the Oxford Advanced American Dictionary

     

    frivolous

     adjective
    adjective
    NAmE//ˈfrɪvələs//
     
    (disapproving)
     
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  1. 1(of people or their behavior) silly or amusing, especially when such behavior is not suitable frivolous comments/suggestions Sorry, I was being frivolous.
  2. 2having no useful or serious purpose frivolous pastimes/pleasures
frivolously
 
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adverb
See the Oxford Advanced Learner's Dictionary entry: frivolous