Word.ws English Dictionary

lackbrain

lackbrain noun: a person who lacks brains; an idiot.

Noun

lackbrain (plural lackbrains)

  1. (derogatory) A person who lacks brains; an idiot.
    • Among themselves, his clerical brethren who employed him to produce revivals, acknowledged him to be but a pitiful lackbrain...1841, George Rogers, Tales from Life
    • "Is that clear enough, even for you, lackbrain?"1995, Catherine Coulter, Lord of Falcon Ridge

Forms of lackbrain

plurallackbrains

Origin of lackbrain

From lack + brain.

Questions about lackbrain

What does lackbrain mean?
Lackbrain means a person who lacks brains; an idiot.
What part of speech is lackbrain?
Lackbrain is a noun.
What is the plural of lackbrain?
The plural of lackbrain is lackbrains.

Words near lackbrain in the dictionary

  1. lackalls
  2. Lackard
  3. Lackawanna
  4. Lackawanna County
  5. Lackawaxen
  6. lackbrain
  7. lackbrained
  8. lackbrains
  9. lacke
  10. lacked
  11. Lackenby

Source and license

Adapted from Wiktionary: lackbrain (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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