Deliberate deceptiveness in behavior or speech; the practice of saying one thing while meaning another. Double-dealing or intentional dishonesty.
From Latin 'duplicitas,' meaning doubleness, from 'duplex' (double). The word evolved from the literal sense of 'being double' to the figurative meaning of having two faces or being two-faced in one's dealings.
Think 'duplicate' + 'city' - imagine a city where everything has an exact duplicate, including people's personalities. Someone with duplicity is like having two versions of themselves: the honest public version and the deceptive private one.
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