double-dealing

(noun) acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another. Synonyms: duplicity.

(adj) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another. Synonyms: ambidextrous, deceitful, duplicitous, Janus-faced, two-faced, double-faced, double-tongued. Examples: "She was a deceitful scheming little thing"- israel zangwill." "A double-dealing double agent." "A double-faced infernal traitor and schemer"- w.m.thackeray."