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double-dealing

/ˌdʌbəlˈdiːlɪŋ/ noun

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about double-dealing at Wordnik → Where our words come from →

  1. Acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another.

adjective

  1. 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

Origin

From the practice of dealing oneself multiple cards in order to gain an advantage in a game.

From Wiktionary, via Kaikki.org (CC BY-SA)