conniving
From Longman Dictionary of Contemporary Englishconnivingcon‧niv‧ing /kəˈnaɪvɪŋ/ adjective LET/ALLOWa conniving person secretly tries to gain something or harm someone – used to show disapprovalExamples from the Corpusconniving• Fourthly, Hopkins was a conniving priest, a possible Templar, with an open distaste for our King.• Whitaker and Givens give the proceedings a much needed lift and the latter shows promise and the conniving seductress.• The main character, Fleur, is a conniving woman who will do almost anything to defeat her rivals.