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, like someone suing McDonald's for making the coffee too hot (which actually happened). 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.
adj not serious in content or attitude or behavior
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
showing inappropriate levity
silly or trivial
intended primarily as entertainment; not serious or profound
concerned with trivialities
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
not to be taken lightly
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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