marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another; she was a deceitful scheming little thing- Israel Zangwill; a double-dealing double agent; a double-faced infernal traitor and schemer- W.M.Thackeray

[ Syn: ambidextrous , deceitful , double-dealing , janus-faced , two-faced , double-faced , double-tongued ]