What is the definition or description of: narcissistic personality?

Narcissism: Narcissistic personality disorder is a psychiatric disorder that usually first is apparent in adolescence or early adulthood. It is associated with the need for much more attention and appreciation than usual. A common theory is that underlying this need is a great sense of doubt about one's value as a person.

Cluster B disorder: Narcissistic personality, according to the dsm (diagnostic manual for professionals) refers to a pervasive pattern of an exaggerated sense of self-importance, need for admiration, and lack of empathy.

Narcissism: The hallmark of a narcissist is an immense ego, grandiosity, and self-importance, as well as being entitled, and a tendency to use and objectify others as well as thinking of people in all-good or all-bad terms instead of shades of gray. The core of a narcissist is profound insecurity.