Open English Wordnet
Adjectives
(s)ambidextrous, deceitful, double-dealing, duplicitous, Janus-faced, two-faced, double-faced, double-tonguedmarked 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)
(s)Janus-faced, two-facedhaving two faces — one looking to the future and one to the past“Janus the two-faced god”