Meaning of “frivolous” in the English Dictionary

"frivolous" in British English

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uk /ˈfrɪv.əl.əs/ us /ˈfrɪv.əl.əs/

behaving in a silly way and not taking anything seriously:

I think he sees her as a frivolous young woman.

A frivolous activity or object is silly or not important rather than useful or serious:

I feel like doing something completely frivolous today.
adverb uk /ˈfrɪv.əl.ə us /ˈfrɪv.əl.ə
noun [ U ] uk /ˈfrɪv.əl.əs.nəs/ us /ˈfrɪv.əl.əs.nəs/

(Definition of “frivolous” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"frivolous" in American English

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us /ˈfrɪv·ə·ləs/

(of people) behaving in a silly and foolish way, or (of activities or objects) silly or unimportant:

I’m very frivolous – I just like to have fun.
With our justice system there are a lot of frivolous cases that go to court.
adverb us /ˈfrɪv·ə·lə·sli/

We don’t have a monthly budget, but we don’t spend frivolously either.

(Definition of “frivolous” from the Cambridge Academic Content Dictionary © Cambridge University Press)