English

fleabrain

From flea + brain.

A compound of flea + brain

Proto-Germanic *flauhaz

Proto-West Germanic *flauh

Old English flēah

Middle English fle

English flea

Proto-Germanic *bragną

Proto-West Germanic *bragn

Old English bræġn ‘brain’

Middle English brayn ‘brain’

English brain

Today it means

noun A stupid or foolish person

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

Etymograph / fleabrain