unsound

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be of unsound mind

To have impaired or dysfunctional thought, memory, or cognitive understanding; unable to think or understand for oneself. My poor grandfather has been of unsound mind ever since he suffered that stroke last year. I've been so sleep deprived lately that it feels like I'm of unsound mind! You can't tell people you want to start a business selling bees as pets—they'll think you're of unsound mind!

of unsound mind

Having 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.

of ˌunsound ˈmind

(law) not responsible for your actions because of a mental illness or condition: He escaped a prison sentence by reason of unsound mind at the time the crime was committed.