dissimulator
From LSJ
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Latin > English (Lewis & Short)
dissĭmŭlātor: ōris, m. id.,
I a dissembler, concealer, Sall. C. 5, 4; Quint. 2, 2, 5; Tac. H. 2, 56; Hor. Ep. 1, 9, 9 al.