Frivolous things are silly or unnecessary. If something is frivolous, then you don't need it.

Frivolous things are goofy, useless, or just plain dumb. The word is often used to describe lawsuits. A frivolous lawsuit has no value and will be a waste of the court's time. If someone is frivolous, that person shouldn't be taken seriously because he's always fooling around and never gets anything done. Frivolous is pretty much the opposite of essential.

Definitions of frivolous
  1. adjective
    not serious in content or attitude or behavior
    “a frivolous novel”
    “a frivolous remark”
    “a frivolous young woman”
    concerned with or comprehending only what is apparent or obvious; not deep or penetrating emotionally or intellectually
    airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly
    lacking seriousness; given to frivolity
    flighty, flyaway, head-in-the-clouds, scatterbrained
    guided by whim and fancy
    flippant, light-minded
    showing inappropriate levity
    idle, light
    silly or trivial
    intended primarily as entertainment; not serious or profound
    concerned with trivialities
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    concerned with work or important matters rather than play or trivialities
    earnest, sincere, solemn
    characterized by a firm and humorless belief in the validity of your opinions
    grave, sedate, sober, solemn
    dignified and somber in manner or character and committed to keeping promises
    excessively serious
    not to be taken lightly
    serious-minded, thoughtful
    acting with or showing thought and good sense
    tending to make sober or more serious
    of a substantial character and not frivolous or superficial
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