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 ?
His plea that he was of unsound mind at the relevant time is false and death penalty is justified in this case," a division bench comprising Justices V.
Judges in Crete ruled Hogan was of unsound mind when he leaped from the balcony following a row with his ex-wife Natasha.
Nine days later, Rodman cried fraud and filed for an annulment, saying he was of unsound mind when he recited his vows.
QI AM being sued by a relative who has been granted Legal Aid to try to prove that my mother was of unsound mind when she made her will.