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 nursing home argued that the tolling of the statute of limitations occurs only if the person entitled to commence the lawsuit is of unsound mind at the time.
One would say she is of unsound mind in that she was not able to use her mind properly like other people.