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1. Suffering from dementia.
2. Informal Crazy or foolish.
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|Noun||1.||dementedness - mental deterioration of organic or functional origin|
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