Understanding the Nine Criteria of Narcissistic Personality DisorderNarcissistic Personality Disorder (NPD) is defined by a pattern of grandiosity, a need for admiration, and a lack of empathy. Below are the nine diagnostic criteria:Arrogant and Haughty BehaviourNarcissists often display an inflated sense of self-importance, looking down on others and treating them with disdain.A Belief They’re SpecialThey believe they are unique and can only be understood by equally special or high-status indiv