du‧plic‧i‧ty /djuːˈplɪsəti, djuːˈplɪsɪti $ duː-/
noun [uncountable][
Date: 1400-1500;
Language: French;
Origin: duplicité, from Latin duplex; ⇒ duplex]
dishonest behaviour that is intended to deceive someone
—duplicitous adjective [TahlilGaran] Dictionary of Contemporary English ▲