English

harebrain

From hare + brain.

A compound of hare + brain

Proto-Indo-European *ḱh₂s-én-

Proto-Germanic *hesô

Proto-West Germanic *hasō ~ *haʀ-

Old English hara

Middle English hare ‘a hare or its meat’

English hare

Proto-Germanic *bragną

Proto-West Germanic *bragn

Old English bræġn ‘brain’

Middle English brayn ‘brain’

English brain

Today it means

noun A person who lacks good sense; one who is foolish and reckless.

Language periods are conventional ranges, not dates for this word.

Etymograph / harebrain