Wikipedia should therefore not encourage his lying nor hold a demented person up to ridicule.

Insistence on severity eliminates mild cases of dementia or instances where a mildly demented person is able to manage when little intellectual ability is needed.

She once saw a colleague knock down a demented elderly person who kept barging into her bedroom.

Persons who have been declared demented or mentally deficient, persons under guardianship, etc.

I have offered you my love, sympathy and understanding and you take it all as the ramblings of a demented person.

A New Orleans F.B.I. agent reported that "her talk impressed me as being that of a demented person."

"It looks like the act of a demented person."

I do know that experts in dementia recommend that you repeatedly tell a demented person the truth when they are mistaken in their perceptions.

A flash of paranoia: had some demented person injected a lethal substance into the milk?

There are times when a demented person should be humored; on other occasions, argument seems to help them.