Open English Wordnet
Nouns
(n)duplicity, double-dealingacting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another
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)