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Definition of rattlebrained

rattlebrained

/ˈræt.əlˌbreɪnd/
rat · tle · brained
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rattlebrained Lexical Profile

rattlebrained Game Scores & Validity

• adjective

1

Behaving in a silly, flighty, or thoughtless manner; lacking focus, sound judgment, or seriousness.

Example

"His rattlebrained scheme to cross the desert without a map was quickly vetoed by the rest of the expedition."

Synonyms
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Antonyms
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• Nearby Words

rattail
rattan
rattle
rattlebrained
rattled
rattler
rattlesnake

Word Origin & Etymology

Formed in the 18th century from the noun compound 'rattlebrain', evoking the figurative image of a skull whose contents rattle loosely inside due to a lack of steady thought.

Cite this Entry

Wordmom. (2026). Definition of Rattlebrained. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/rattlebrained
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