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Definition of frivolous:

  1. Given to trifling; marked with unbecoming levity; silly; interested especially in trifling matters.
  2. Of little weight or importance; not worth notice; slight; as, a frivolous argument.


idle, ability, foolish, gaga, petty, giddy, flighty, silly, lighthearted, airheaded, stupid, light-headed, trivial, light, empty-headed, birdbrained, flippant, harebrained, lightheaded, flyaway, light-minded, superficial, featherbrained, dizzy, frothy.

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