Yup, total lack of insight of their illness. Had someone like that in my life & it was heartbreaking & frustrating. His kids have to see it and yet...

I Googled, found it had a name (Anosognosia), and rushed back here to post it so I would appear smart and stuff and now you've ruined it.

See Amador's Psychosis and Insight for an in depth look at this. Humans, in general, are poor judges of themselves.