unsound

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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.
See also: mind, of, unsound

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.
See also: mind, of, unsound

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.
See also: mind, of, unsound