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 ?
'According to his uncle, the man has been of unsound mind following a road accident 15 years ago,' he said, adding that the police would continue to track him down.
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. The court rejected both of these arguments after a review of the record showed that he had represented himself for two days, put on witnesses, and submitted exhibits at the hearing, notwithstanding his assertion as a physician that he was incompetent.