This word is generally used in the negative context of a person.This word is related to political manipulations.
Machiavellian acts are related to wrong and improper functioning.
1) He finally relented to Machiavellian acts to gain power.
2) The minister deceived the king with his Machiavellian ideas and dethroned him.
3)"You and your Machiavellian works will finally lead your doom", warned the advisor.
4) It is said that one can flourish in politics if he/she is a Machiavellian.