FRIVOLOUS

[friv.o.lous] adj [ME, fr. L frivolus] (15c) 1 a: of little weight or importance b: having no sound basis (as in fact or law) "a ~ lawsuit"

2. a: lacking in seriousness b: marked by unbecoming levity -- friv.o.lous.ly adv -- friv.o.lous.ness n