• Webster's Revised Unabridged Dictionary
    • a Rattle-brained răt"t'l*brānd` Giddy; rattle-headed.
    • ***
Century Dictionary and Cyclopedia
    • rattle-brained Giddy; chattering; whimsical; rattle-headed.
    • ***
Chambers's Twentieth Century Dictionary
    • adjs Rattle-brained noisy: giddy: unsteady
    • ***


Chambers's Twentieth Century Dictionary
A.S. hrætele, hratele, a plant—from the rattling of the seeds in the capsules; Ger. rasseln, Dut. ratelen, to rattle.


In literature:

Tunemah was a big fool gray that was constitutionally rattle-brained.
"The Mountains" by Stewart Edward White
You haven't given us a single proof yet that Fern is anything but a rattle-brained youngster.
"Main Street" by Sinclair Lewis
He was neither rattle-brained, like Bert, nor coarse like other men she had encountered.
"The Valley of the Moon" by Jack London
I must rest my poor brain now, or it will rattle in my head like a dry walnut.
"The Grey Room" by Eden Phillpotts
Fortunately for me, the jay had found some excitement to keep his rattle-brain busy for a moment.
"Secret of the Woods" by William J. Long
Nay, the gayest rattle-brain is the least likely to escape such a desire.
"Complete Short Works" by Georg Ebers
There is much exaggeration and rattle-brain about this fellow.
"Passages From The American Notebooks, Volume 1" by Nathaniel Hawthorne
But she is rattle-brained.
"Atlantida" by Pierre Benoit
I'm a rattle-brain; and they think I am drowned.
"Dorothy Dale's Camping Days" by Margaret Penrose
The Englishman's plea was unusual, but it was not as rattle-brained as it had seemed at the outset.
"The Husbands of Edith" by George Barr McCutcheon

In news:

The enigmatic energy of LA band Fol Chen rattles the brain like the blissful confusion of a bright-hot summer day.
Got useless facts rattling around in your brain.
Meanwhile, Matt Mitrione is feeling like Scott Junk "rattled his brain".
While I still get in some quality drinking, as a 45-year-old dad, much of my consumption involves a couple of decent beers on a Friday to numb the constant brain rattle caused by two small kids.
Hundreds of yards away a hidden bomb detonates, unleashing a brain-rattling blast wave and propelling scorching bits of shrapnel in every direction.
Insofar as it's possible, Richmond, Virginia's Lamb of God have gone quietly about their brain-rattling business since forming in 1995.