using intelligent or skillful plans to achieve what you want, without people realizing what you are doing synonym cunning, unscrupulous Machiavellian manipulation From the name of Niccolò Machiavelli, an Italian politician (1469-1527), who explained in his book, The Prince, that it was often necessary for rulers to use immoral methods in order to achieve power and success.
See Machiavellian in the Oxford Advanced Learner's Dictionary