charmer, smoothie, smoothy, sweet talker

someone with an assured and ingratiating manner

Tartufe, Tartuffe

a hypocrite who pretends to religious piety (after the protagonist in a play by Moliere)

whited sepulcher, whited sepulchre

a person who is inwardly evil but outwardly professes to be virtuous

type of:

beguiler, cheat, cheater, deceiver, slicker, trickster

someone who leads you to believe something that is not true