False or deceitful dealing; acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another. See Double dealing, under Dealing. Shak. Syn. -- duplicity. [ 1913 Webster + WordNet 1.5 ]
adj. 1. given to deception especially by pretending one set of feelings and acting under the influence of another; as, they accused each other of double-dealing behavior. Syn. -- ambidextrous, deceitful, duplicitous, two-faced. [ WordNet 1.5 +PJC ]