flibbertigibbet
[noun]
Synonyms: scatterbrain, birdbrain, featherbrain, featherhead, harebrain, rattlebrain, rattlehead, shatterbrain

[TahlilGaran] English Synonym Dictionary ▲

flibbertigibbet noun

1. a person who is not serious enough or talks a lot about silly things
   Word Originlate Middle English: probably imitative of idle chatter.

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[TahlilGaran] English Dictionary ▲