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
Jim	JIM	English
Sol (1)	-	Spanish, Portuguese
Cristal	['kristl]
Cirino	chee-REE-no (Italian), thee-REE-no (Spanish), see-REE-no (Latin American Spanish)	Italian, Spanish
Nemesis	NEM-ə-sis (English)	Greek Mythology
Giorgino	jor-JEE-no	Italian