Usually means: Obsessive, irrational thoughts disrupting focus.
Definitions Related words Mentions History
We found 11 dictionaries that define the word crackbrain:

General (10 matching dictionaries)
  1. crackbrain: Merriam-Webster
  2. crackbrain: American Heritage Dictionary of the English Language
  3. crackbrain: Collins English Dictionary
  4. crackbrain: Wordnik
  5. crackbrain: Wiktionary
  6. crackbrain: Webster's New World College Dictionary, 4th Ed.
  7. crackbrain: The Wordsmyth English Dictionary-Thesaurus
  8. crackbrain: Infoplease Dictionary
  9. crackbrain: Dictionary.com
  10. crackbrain: TheFreeDictionary.com

Slang (1 matching dictionary)
  1. crackbrain: Green’s Dictionary of Slang

(Note: See crackbrained as well.)

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Definitions from Wiktionary (crackbrain)

▸ noun:  (slang) An eccentric or crazy person.

Similar:
idiotic, insane, crack, crackpot, crackhead, crackie, crazy, crack head, crazo, crazyhead, more...

Opposite:
sensible, rational, logical, practical, reasonable

▸ Words similar to crackbrain

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▸ Popular adjectives describing crackbrain

▸ Words that often appear near crackbrain

▸ Rhymes of crackbrain

▸ Invented words related to crackbrain

Similar:
idiotic, insane, crack, crackpot, crackhead, crackie, crazy, crack head, crazo, crazyhead, more...

Opposite:
sensible, rational, logical, practical, reasonable



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