2.
marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another; - Israel Zangwill; ; - W.M.Thackeray
she was a deceitful scheming little thing;
a double-dealing double agent;
a double-faced infernal traitor and schemer;
Synonyms:
['deceitful', 'double-dealing', 'duplicitous', 'Janus-faced', 'two-faced', 'double-faced', 'double-tongued']