The quality of being silly or trivial is frivolousness. If your mom wants to have a serious discussion about college, but you can't stop talking about your favorite reality TV shows, she might complain about your frivolousness.

Do you burst into song when your teacher asks you a serious question? Or dress in elaborate costumes that trip you up and get in the way while you're playing volleyball in gym class? Your frivolousness means you're carefree and happy — you probably spend a lot of time laughing. But it can get in the way when you really should be listening hard or getting down to work. The root of frivolousness means "broken, crumbling, or worthless."

Definitions of frivolousness
  1. noun
    the trait of being frivolous; not serious or sensible
    synonyms: frivolity
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    earnestness, serious-mindedness, seriousness, sincerity
    the trait of being serious
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    giddiness, silliness
    an impulsive scatterbrained manner
    a manner lacking seriousness
    fun, playfulness
    a disposition to find (or make) causes for amusement
    lightness, lightsomeness
    the trait of being lighthearted and frivolous
    flippancy, light-mindedness
    inappropriate levity
    humorousness, jocoseness, jocosity, merriness
    the trait of merry joking
    playful humor
    archness, impertinence, perkiness, pertness, sauciness
    inappropriate playfulness
    friskiness, frolicsomeness, sportiveness
    lively high-spirited playfulness
    impishness, mischievousness, puckishness, whimsicality
    the trait of behaving like an imp
    humor, humour, sense of humor, sense of humour
    the trait of appreciating (and being able to express) the humorous
    type of:
    a distinguishing feature of your personal nature
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