noun
a frivolous, flighty, or excessively talkative person
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The flibbertigibbet nature of the new employee's behavior was a cause for concern among the team.
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She's such a flibbertigibbet, always bouncing from one topic to another in conversation.
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I can't stand that flibbertigibbet, she never takes anything seriously.
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Her mind was like a flibbertigibbet, constantly darting from one thought to the next.