flibbertigibbet

noun3

1. •
   An offbeat, skittish person; especially said of a young woman.

   • All this responsibility at such an early age made her a bitchy flibbertigibbet. — 1969
2. •
   A flighty person; someone regarded as silly, irresponsible, or scatterbrained, especially someone who chatters or gossips.

   • “Thou flibbertigibbet,” cried Catwezle, who had been listening, “all is clear as springwater. This Rapkyn was a sorcerer!” — 1970
3. •
   (no longer used) An imp, a fiend.