Dictionary.com
definitions

rattlebrained

[rat-l-breynd]
See more synonyms for rattlebrained on Thesaurus.com
adjective
  1. foolish; flighty; scatterbrained.

Origin of rattlebrained

First recorded in 1710–20; rattle1 + brain + -ed3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for rattlebrained

empty-headed, flighty, harebrained, scatterbrained, silly, airheaded, rattlebrained, scatty, daffy, dizzy, dopey, eccentric, empty, giddy, goofy, inane, dippy, kooky, absurd, asinine

Examples from the Web for rattlebrained

Historical Examples of rattlebrained