1) Act frivolously 2) Act ously 3) Behave 4) Caper all around 5) Dick around, archaically 6) French word used in English 7) To behave frivolously 8) To trifle 9) Trifle 10) Waste time frolicking Found on https://www.crosswordclues.com/clue/frivol
Friv'ol intransitive verb To act frivolously; to trifle. Kipling . -- Friv'ol*er , Friv'ol*ler , noun [ All Colloq.] Found on http://www.encyclo.co.uk/webster/F/78