Narcissists are characterized by an all-pervasive pattern of grandiosity (in fantasy or behavior), need for admiration or adulation and lack of empathy, usually beginning by early adulthood and present in various contexts. Five (or more) of the following criteria are considered necessary for the clinical diagnosis to be met:
* Feels grandiose and self-important (e.g., exaggerates accomplishments, talents, skills, contacts, and personality traits to the point of lying, demands to be recognized as superior without commensurate achievements);
* Is obsessed with fantasies of unlimited success, fame, fearsome power or omnipotence, unequalled brilliance (the cerebral narcissist), bodily beauty or sexual performance (the somatic narcissist), or ideal, everlasting, all-conquering love or passion;
* Firmly convinced that he or she is unique and, being special, can only be understood by, should only be treated by, or associate with, other special or unique, or high-status people (or institutions);
* Requires excessive admiration, adulation, attention and affirmation - or, failing that, wishes to be feared and to be notorious (narcissistic supply);
* Feels entitled. Demands automatic and full compliance with his unreasonable expectations for special and favorable priority treatment.
* Is "interpersonally exploitative", i.e., uses others to achieve his or her own ends;
* Devoid of empathy. Is unable or unwilling to identify with, acknowledge, or accept the feelings, needs, preferences, priorities, and choices of others;
* Constantly envious of others and seeks to hurt or destroy the objects of his frustration. Suffers from persecutory (paranoid) delusions as he believes that they feel the same about him or her and are likely to act similarly;
* Behaves arrogantly and haughtily. Feels superior, omnipotent, omniscient, invincible, immune, "above the law", and omnipresent (magical thinking). Rages when frustrated, contradicted, or confronted by people he considers inferior to him and unworthy.
The criteria above are based on or summarized from: Diagnostic and Statistical Manual of Mental Disorders, fourth edition, text revision (DSM IV-TR) 2000. American Psychiatric Association, Washington, DC.
http://en.wikipedia.org/wiki/Narcissist