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
Hamida	-	Arabic
Fumnanya	-	Western African, Igbo
Delilah	[di'lailə]
Marganita	-	Hebrew
Hollis	['hɔlis]
Fannie	['fæni]