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}]