du ‧ plic ‧ i ‧ ty /djuːˈplɪsəti, djuːˈplɪsɪti $ duː-/ BrE AmE noun [uncountable]
[ Date: 1400-1500 ; Language: French ; Origin: duplicité , from Latin duplex ; ⇨ ↑ duplex ]
dishonest behaviour that is intended to deceive someone
—duplicitous adjective