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Here is how to instantly tell a narcissist apart from a psychopath:

The narcissist maintains one island of stability in his life while all the other dimensions of his existence are a chaotic maelstrom. He remains married to the same woman for decades even as he dizzyingly switches between careers and workplaces. Or he climbs the corporate ladder with the same enterprise for 35 years, having divorced and remarried five different spouses.

The psychopath has no such peaceable oasis: every single aspect of his life is mayhem and pandemonium. His personal life is disordered beyond any timelines, as is his kaleidoscopic range of vocations, his myriad on and off "friendships", his antisocial or defiant pursuits, his numerous domiciles, and so on.