two-faced

英['tu:'feist] 美

1. 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

2. having two faces--one looking to the future and one to the past;: "Janus the two-faced god"