Source : WordNet®

two-faced
     adj 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 [syn: {ambidextrous}, {deceitful}, {double-dealing},
             {duplicitous}, {Janus-faced}, {double-faced}, {double-tongued}]
     2: having two faces--one looking to the future and one to the
        past; "Janus the two-faced god" [syn: {Janus-faced}]