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
Yosif	-	Bulgarian
Marin	-	French, Romanian, Croatian, Serbian, Bulgarian, Macedonian
Gertraud	GER-trowt	German
Agassiz	['ægəsi]
Shahd	-	Arabic
Rachana	-	Indian, Marathi, Hindi, Gujarati, Nepali