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
Betty	['beti]
Kean	-	Irish
Johna	JAHN-ə	English (Rare)
Syed	-	Urdu, Punjabi, Bengali
Alison	AL-i-sən (English), a-lee-SAWN (French)	English, French
Reijo	RAY-yo	Finnish