From Longman Dictionary of Contemporary EnglishMachiavellianMach‧i‧a‧vel‧li‧an /ˌmækiəˈveliən◂/ adjective PPPPOWERusing clever but immoral methods to get what you want SYN devious
Examples from the Corpus
Machiavellian• a Machiavellian conspiracy• They can resort to Byzantine, even Machiavellian manipulations.• Christie and Geis also sought to find out why people differ on the Machiavellian scale. 