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The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5, 2013) indicates that a person with Narcissistic Personality Disorder possesses at least five of the following nine criteria, typically without possessing the commensurate personal qualities or accomplishments for which they demand respect and status:

Grandiosity with expectations of superior treatment from other people
Continually demeaning, bullying and belittling others
Exploiting others to achieve personal gain
Lack of empathy for the negative impact they have on the feelings, wishes, and needs of other people
Fixation on fantasies of power, success, intelligence, attractiveness, etc.
Self-perception of being unique, superior, and associated with high-status people and institutions
Need for continual admiration from others
Sense of entitlement to special treatment and to obedience from others
Intense envy of others, and the belief that others are equally envious of them[7][10]