Usually means: Person with very poor judgment.
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We found 9 dictionaries that define the word lackbrain:

General (9 matching dictionaries)
  1. lackbrain: Wordnik
  2. lackbrain: Wiktionary
  3. Lackbrain: Dictionary.com
  4. Lackbrain: Online Plain Text English Dictionary
  5. lackbrain: Webster's Revised Unabridged, 1913 Edition
  6. Lackbrain: AllWords.com Multi-Lingual Dictionary
  7. lackbrain: Webster's 1828 Dictionary
  8. lackbrain: FreeDictionary.org
  9. Lackbrain: TheFreeDictionary.com

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Definitions from Wiktionary (lackbrain)

▸ noun:  (derogatory) A person who lacks brains; an idiot.

Similar:
beanbrain, idiot, dickbrain, lame-brain, dick-brain, addle-brain, lamebrain, lame brain, brainlet, lardbrain, more...

Opposite:
genius, intellectual, brainiac

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Similar:
beanbrain, idiot, dickbrain, lame-brain, dick-brain, addle-brain, lamebrain, lame brain, brainlet, lardbrain, more...

Opposite:
genius, intellectual, brainiac



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