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
Rayner	RAY-nər	English (Archaic)
Iro	-	Greek
Pilvi	PEEL-vee	Finnish
Keiran	-	English (Rare)
Ashleigh	ASH-lee	English (Modern)
Alojz	-	Slovene, Slovak, Croatian