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Adjective: frivolous  fri-vu-lus
  1. Not serious in content, attitude or behaviour
    "a frivolous novel"; "a frivolous remark"; "a frivolous young woman"

See also: airheaded, dippy, dizzy, earnestness, empty-headed, featherbrained, flighty, flippant, flyaway, giddy, head-in-the-clouds, idle, light, lightheaded, light-headed, light-minded, scatterbrained, serious-mindedness, seriousness, silly, sincerity, superficial, trivial

Antonym: serious

Encyclopedia: Frivolous