Envy is an emotion which occurs when a person lacks another's quality, skill, achievement, or possession and wishes that the other lacked it.
Aristotle defined envy as pain at the sight of another's good fortune, stirred by "those who have what we ought to have". Bertrand Russell said that envy was one of the most potent causes of unhappiness.
Narcissistic personality disorder is complicated and nuanced. It is defined as a pervasive pattern of grandiosity (sense of superiority in fantasy or behavior), need for admiration, and lack of empathy, beginning by early adulthood and occurring in a variety of contexts.
In addition to grandiosity, narcissistic personality disorder has a significant vulnerability aspect, and individuals may alternate between the two.
Vulnerability may make individuals very sensitive to criticism or defeat and although they may not show it, those experiences may leave them feeling ashamed, degraded and empty. People with the disorder may react to criticism or defeat with disdain and defiance, or with social withdrawal or an appearance of humility, which masks the grandiosity
