All three traits involve a disregard for others’ welfare,
but Machiavellianism is more calculating,
Narcissism more about self-image, and
Psychopathy more about emotional callousness and impulsivity.
Narcissism is characterized by grandiosity, pride, egotism, and a lack of empathy.
Machiavellianism is characterized by manipulativeness, indifference to morality, lack of empathy, and a calculated focus on self-interest.