An all-pervasive pattern of grandiosity (in fantasy or behaviour), 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 must be met:

Feels grandiose and self-important (e.g., exaggerates achievements and talents 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. Expects unreasonable or special and favorable priority treatment. Demands automatic and full compliance with his or her expectations

Is "interpersonally exploitative", i.e., uses others to achieve his or her own ends

Devoid of empathy. Is unable or unwilling to identify with or acknowledge the feelings and needs of others

Constantly envious of others or believes that they feel the same about him or her

Arrogant, haughty behaviours or attitudes coupled with rage when frustrated, contradicted, or confronted

Some of the language in the criteria above is based on or summarized from:

American Psychiatric Association. (2000). Diagnostic and statistical manual of mental disorders, fourth edition, Text Revision (DSM IV-TR). Washington, DC: American Psychiatric Association.

The text in italics is based on:

Sam Vaknin. (2003). Malignant Self Love - Narcissism Revisited, fourth, revised, printing.