What is Pathological Narcissism?

Narcissist…we hear the term quite often these days, at work, in the media, maybe even among friends and family. In fact, many of you have likely encountered one or more narcissists in your lifetime and perhaps even live, work, or are in some kind of relationship with one. Some of you are familiar with the general definition of a narcissist, and perhaps, casually label friends, acquaintances, colleagues, or some of your relatives as such. But how many of you actually know the clinical definition of a pathological narcissist?