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frivolous (adj.)

mid-15c., from Latin frivolus "silly, empty, trifling, worthless," diminutive of *frivos "broken, crumbled," from friare "break, rub away, crumble" (see friable). In law (by 1736), "so clearly insufficient as to need no argument to show its weakness." Related: Frivolously; frivolousness.

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Definitions of frivolous from WordNet

frivolous (adj.)
not serious in content or attitude or behavior;
a frivolous young woman
a frivolous remark
a frivolous novel
From wordnet.princeton.edu