double-dealing

Noun
  1. Acting in bad faith;
    Deception by pretending to entertain one set of intentions while acting under the influence of another (synset 100754583)
Adjective
  1. Marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another (synset 301225960)
    "she was a deceitful scheming little thing"; "a double-dealing double agent"; "a double-faced infernal traitor and schemer"

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