Malignant narcissism is a psychological syndrome comprising an extreme mix of narcissism, antisocial personality disorder, aggression, and sadism. Often grandiose, and always ready to raise hostility levels, the malignant narcissist undermines organizations in which they are involved, and dehumanizes the people with whom they associate.
Malignant narcissism is a hypothetical, experimental diagnostic category. Narcissistic personality disorder is found in the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-TR), while malignant narcissism is not.
The social psychologist Erich Fromm first coined the term "malignant narcissism" in 1964, describing it as a "severe mental sickness" representing "the quintessence of evil". He characterized the condition as "the most severe pathology and the root of the most vicious destructiveness and inhumanity".