Etymology
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duplicitous (adj.)

"deceptive, acting or speaking differently of the same thing at different times or to different persons," 1831; see duplicity + -ous.

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Definitions of duplicitous

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-faced infernal traitor and schemer"- W.M.Thackeray;
Synonyms: ambidextrous / deceitful / double-dealing / Janus-faced / two-faced / double-faced / double-tongued
From wordnet.princeton.edu