— frivoler; esp. Brit., frivoller , n.
/friv"euhl/ , v. , frivoled, frivoling or ( esp. Brit. ) frivolled, frivolling . Informal.
v.i.
1. to behave frivolously; trifle.
v.t.
2. to spend frivolously (usually fol. by away ): to frivol away one's time.
[ 1865-70; back formation from FRIVOLOUS ]