Two-faced
WordNet
adjective
(1) Having two faces--one looking to the future and one to the past
"Janus the two-faced god"
(2) 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