lackbrain

noun

lackbrain

noun

Etymology From lack + brain.

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:

1 more example

One moment I was staring up at that lackbrain Sister Margaret, and the next I was staring at that lackbrain chieftain...2007, Sandra Hill, Down and Dirty:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.