frivolous

US /ˈfrɪv.əl.əs/

UK /ˈfrɪv.əl.əs/

1.

not having any serious purpose or value

:

•

She made a frivolous excuse for being late.

•

The lawsuit was dismissed as frivolous.

:

trivial petty silly foolish senseless

:

serious important meaningful

2.

(of a person) carefree and not serious

:

•

She has a rather frivolous attitude towards life.

•

His frivolous nature often led him into trouble.

:

flighty giddy silly playful lighthearted

:

serious earnest responsible