rattlebrain

Etymology

From rattle + brain.

Why this word is great

RATTLEBRAIN — [Noun] A person who is frivolous, flighty, or lacking in seriousness. From "rattle" (suggesting noisy, rapid, or empty talk) + "brain" (referring to the mind or intellect). Unlike "addlepate" (which implies muddled confusion) or "featherhead" (which suggests lightness without malice), "rattlebrain" conjures the ceaseless clatter of a mind devoid of ballast. It is the gadfly who mistakes velocity for insight, the dilettante who collects enthusiasms like trinkets, or the orator whose words dissolve before they land—a consciousness so buoyant it leaves no wake in its passing.

noun

  1. A rattlebrained person.“a genial young fellow enough to look at, and something of a rattlebrain, to all appearance.”