Silly, especially at an inappropriate time or in an inappropriate manner. / Of little weight or importance; not worth notice; slight; trivial.

(uncountable) The quality of being frivolous / (countable) The result of being frivolous

In a frivolous manner

plural of frivolousness

(nonstandard) frivolous, trifling, silly

frivolous act / state of being frivolous

(intransitive) To behave frivolously. / (intransitive) To trifle.

An unserious person; a shallow person. / An idle diversion or pastime; a frivolity.

plural of frivol

plural of frivolity