flibberty-gibbet

Noun

flibbertigibbet (plural flibbertigibbets)

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, Kurt Vonnegut Jr., chapter 2 (pages 19–42), in Slaughterhouse-Five, or, The Children’s Crusade: A Duty-dance with Death, Vintage edition (1991 paperback), London: Vintage Books, published 2000...
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, Richard Carpenter, Catweazle, Harmondsworth: Puffin Books, page 50
3. (archaic) An imp, a fiend.