double-dealing

nouns

acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another
double-dealing, duplicity

adjectives

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
Janus-faced, ambidextrous, deceitful, double-dealing, double-faced, double-tongued, duplicitous, two-faced