The hallmarks of Narcissistic Personality Disorder (NPD) are grandiosity, a lack of empathy for other people, and a need for admiration. People with this condition are frequently described as arrogant, self-centered, manipulative, and demanding.

Narcissists cut a wide, swashbuckling figure through the world. The most benign type may be the charismatic leader with an excess of charm, whose only vice may be his or her inflated amour-propre.

Does this sound like anyone you may know? Like perhaps Donald Trump?