Lackbrain

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A person who lacks brains; an idiot. derogatory

    "Among themselves, his clerical brethren who employed him to produce revivals, acknowledged him to be but a pitiful lackbrain..."

Synonyms

All synonyms
dullardlack mindlack-mind

Example

More examples

"Among themselves, his clerical brethren who employed him to produce revivals, acknowledged him to be but a pitiful lackbrain..."

Etymology

From lack + brain.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.