The Collaborative International Dictionary of English v.0.48:

Tartuffe \Tar*tuffe"\, Tartufe \Tar*tufe"\, n. [F. tartufe.]
   A hypocritical devotee. See the Dictionary of Noted Names in
   Fiction.
   [1913 Webster] Tartuffish

WordNet (r) 3.0 (2006):

Tartuffe
    n 1: a hypocrite who pretends to religious piety (after the
         protagonist in a play by Moliere) [syn: Tartuffe,
         Tartufe]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "Tartuffe":
   Holy Willie, Joseph Surface, Mawworm, Pecksniff, Pharisee,
   affecter, canter, canting hypocrite, dissembler, dissimulator,
   fair-weather friend, false friend, formalist, hypocrite,
   lip server, lip worshiper, mealymouth, pharisee, phony, pietist,
   pious fraud, poser, ranter, religionist, religious hypocrite,
   sanctimonious fraud, sniveler, snuffler, spiritual humbug,
   summer soldier, whited sepulcher