a half-wit

(informal)

a stupid person Some half-wit had filled the kettle too full and water spilt out everywhere.

Name	Pronounced	Usage
Ganzorig	-	Mongolian
Kendal	KEN-dahl	English (Modern)
Annion	['ænjən]
Cleitus	-	Ancient Greek (Latinized)
Rokuro	ṙo-koo-ṙo:	Japanese
Suri	-	Yiddish