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English definition of “frivolous”

frivolous

adjective  /ˈfrɪv·ə·ləs/ us  
(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.
frivolously
adverb  /ˈfrɪv·ə·lə·sli/ us  
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)
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