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Donald Trump appears to be exhibiting many of the outward characteristics of Narcissistic Personalty Disorder (NPD). NPD is a defect in oneâs personality that manifests as an excessive mental preoccupation with oneself â usually to the detriment of everyone else.
mental illness in Medicine Expand. mental illness n. Any of various disorders characterized chiefly by abnormal behavior or an inability to function socially, including diseases of the mind and personality and certain diseases of the brain. Also called mental disease, mental disorder. mental illness.