be of unsound mind

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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
References in periodicals archive ?
The physician also asserted the hearing should not have been held because he was incompetent as a result of the effects of the HIV Encephalopathy at the time of the hearing and that the two-year statute of limitations on the filing of appeals of the Board's ruling should be extended because he had been of unsound mind.