A 54-year-old male patient works as an engineer. At the age of 35, he got infected with syphilis and treated it with "traditional remedies". About 5 years ago, he became forgetful, unable to cope with work, told cynical jokes, bought useless things, collected cigarette butts in the street. Objectively: the patient is indifferent, has slow speech, dysarthria, can make only primitive judgments, is unabe to perform simple arithmetic operations or explain simple metaphors. The patient is untidy, takes no interest in anything, passive. Considers himself to be completely healthy. Qualify mental condition of the patient: