flibbertigibbet
/flĭb′ər-tē-jĭb″ĭt/

noun
A silly, scatterbrained, or garrulous person.

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

A flighty person; someone regarded as silly, irresponsible, or scatterbrained, especially someone who chatters or gossips.

A female fool.

The American Heritage® Dictionary of the English Language, 5th Edition •