be of unsound mind

To have impaired or dysfunctional thought, memory, and/or cognitive understanding; unable to think and/or understand for oneself. My poor grandfather has been of unsound mind ever since he suffered that stroke last year.

Common Names:

Name	Pronounced	Usage
Mieszko	MYESH-kaw	Polish
Appius	AP-pi-uws (Ancient Roman), AP-ee-əs (English)	Ancient Roman
MickaËL	-	French
Dragoslava	-	Serbian, Medieval Slavic
Ackery	['ækəri]
Krikor	-	Armenian