Narcissistic Personality Disorder is a disorder in which a person has a grandiose self-importance, preoccupation with fantasies of unlimited success, a driven desire for attention and admiration, an intolerance of criticism, and disturbed self-centered interpersonal relations. They are often referred to as being conceited. They generally have a low self-esteem, as well. They act selfish interpersonally, with a sense of entitlement.