Main entry: duplicity, double-dealing
Definition: acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another
Main entry: duplicitous, double-dealing, double-faced, double-tongued, deceitful, ambidextrous, Janus-faced, two-faced
Definition: marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another
Usage: she was a deceitful scheming little thing- Israel Zangwill; a double-dealing double agent; a double-faced infernal traitor and schemer- W.M.Thackeray