du·plic·i·tous /dʊˈplɪsətəs ||djʊ-/
duplicitous
adj : 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,
Janus-faced, two-faced, double-faced, double-tongued]