Usually means: Person exhibiting frivolous or scatterbrained behavior.
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We found 9 dictionaries that define the word rattlebrain:

General (9 matching dictionaries)
  1. rattlebrain: Merriam-Webster
  2. rattlebrain: Collins English Dictionary
  3. rattlebrain: Wordnik
  4. rattlebrain: Wiktionary
  5. rattlebrain: Webster's New World College Dictionary, 4th Ed.
  6. rattlebrain: The Wordsmyth English Dictionary-Thesaurus
  7. rattlebrain: Infoplease Dictionary
  8. rattlebrain: Dictionary.com
  9. rattlebrain: TheFreeDictionary.com

(Note: See rattlebrained as well.)

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Definitions from Wiktionary (rattlebrain)

▸ noun:  A rattlebrained person.

Similar:
rattlepated, foolish, scatterbrained, scatty, rattlecap, addlebrain, rattler, madbrain, der-brain, harebrain, more...

Opposite:
sage, wise, astute, shrewd

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Similar:
rattlepated, foolish, scatterbrained, scatty, rattlecap, addlebrain, rattler, madbrain, der-brain, harebrain, more...

Opposite:
sage, wise, astute, shrewd



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