Using clever tricks or lies in order to achieve something: clever and dishonest.
1) A Machiavellian battle was fought between two brothers for the company's control.
2) The article recounted yet another tale of a Machiavellian dictator.
Niccolo Machiavelli who was an Italian political philosopher.
cutthroat, immoral, unprincipled, unconsciable, unethical
ethical, moral, principled.