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English definition of “frivolous”

frivolous

adjective uk   /ˈfrɪv.əl.əs/ us  
behaving in a silly way and not taking anything seriously: I think he sees her as a frivolous young woman.Not showing careful thought describes an activity or object that is silly or not important rather than useful or serious: I feel like doing something completely frivolous today.Useless and futile
frivolously
adverb uk   /-li/ us  
Not showing careful thought
frivolousness
noun [U] uk   /-nəs/ us  
Useless and futileStupid and silly behaviour
(Definition of frivolous from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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