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 ?
A statement released by the family said: "The outcome is as we expected it to be and, given the evidence heard in court, the determination that he was of unsound mind is completely understandable.
He said Article 63 (a) suggested that a person could be disqualified from being elected or a parliament member if he was of unsound mind and had been so declared by a competent court of law.
"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.
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.