insanity - relatively permanent disorder of the mind

alcohol amnestic disorder, alcoholic dementia, Korsakoff's psychosis, Korsakoff's syndrome, Korsakov's psychosis, Korsakov's syndrome, polyneuritic psychosis - dementia observed during the last stages of severe chronic alcoholism; involves loss of memory for recent events although long term memory is intact

presenile dementia - dementia with onset before the age of 65

senile dementia, senile psychosis - dementia of the aged; results from degeneration of the brain in the absence of cerebrovascular disease