(taken from wiki)

Narcissistic personality disorder (NPD) is a personality disorder defined by the Diagnostic and Statistical Manual of Mental Disorders, the diagnostic classification system used in the United States, as “a pervasive pattern of grandiosity, need for admiration, and a lack of empathy.”^[1]

The narcissist is described as being excessively preoccupied with issues of personal adequacy, power, and prestige.^[2] Narcissistic personality disorder is closely linked to self-centeredness. It is also colloquially referred to as the god complex.

[...]

A pervasive pattern of grandiosity (in fantasy or behavior), need for admiration, and lack of empathy, beginning by early adulthood and present in a variety of contexts, as indicated by five (or more) of the following:

1. has a grandiose sense of self-importance (e.g., exaggerates achievements and talents, expects to be recognized as superior without commensurate achievements)
2. is preoccupied with fantasies of unlimited success, power, brilliance, beauty, or ideal love
3. believes that he or she is “special” and unique and can only be understood by, or should associate with, other special or high-status people (or institutions)
4. requires excessive admiration
5. has a sense of entitlement, i.e., unreasonable expectations of especially favorable treatment or automatic compliance with his or her expectations
6. is interpersonally exploitative, i.e., takes advantage of others to achieve his or her own ends
7. lacks empathy: is unwilling to recognize or identify with the feelings and needs of others
8. is often envious of others or believes others are envious of him or her
9. shows arrogant, haughty behaviors or attitudes

[...] /end