be of unsound mind

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 ?
Constitutionally, speaker or his deputy can be impeached on grounds of gross misconduct, abuse of office, incompetence, gross violation of laws or if he or she is proved to be of unsound mind. Related Stories
Sandra and Les Jackson are now seeking closure after their son, Tom's killer, was found to be of unsound mind ANDY STENNING
The complainant, believed to be of unsound mind, said he was also willing to contribute financially to assist in the matter.
Attempts are made to disparage me so badly that I am made out to be of unsound mind. Repeatedly, allegations were made that the administration during my time was worse,'' he said in a statement.
He said the incident occurred about noon when a man, who looked disheveled and believed to be of unsound mind, approached her and asked where she was going,.