Machiavelian a. : Of or pertaining to Machiavel, or to his supposed principles; politically cunning; characterized by duplicity or bad faith; crafty.

Machiavelian n. : One who adopts the principles of Machiavel; a cunning and unprincipled politician.

Example:
in what way was pol pot Machiavelian and in what ways was he not? (doing a paper and dont really understand)?

Taxonomy
Machiavellianism, MACH-IV, free encyclopedia, psychopathy, massacre, Sydney Anglo, Niccolò Machiavelli, Prince, English, scholars, dead, Christie, Geis, Machs, the dark, Spielberger, OED, the Italian Renaissance.

Defination from the web:
Machiavellian and variants became very popular in the late 16th century in English, though "Machiavellianism" itself is first cited by the OED from 1626. ... subject, with the Duke of Guise and Catherine de' Medici both depicted as Machiavellian plotters, bent on evil from the start. ...