frivolous
ETYM Latin frivolus; prob. akin to friare to rub, crumble, Eng. friable: cf. French frivole.
Not serious in content or attitude or behavior.
airheaded · dizzy · empty-headed · featherbrained · flighty · flippant · flyaway · giddy · head-in-the-clouds · idle · light · light-headed · light-minded · lightheaded · scatterbrained · silly · superficial · trivial
Friuli · Friuli-Venezia Giulia · frivol · frivolities · frivolity · frivolous · frivolously · frivolousness · frizz · frizzed