Hypocrite(n.) One who professes beliefs he is not willing to uphold; one who plays a part; especially, one who, for the purpose of winning approbation of favor, puts on a fair outside seeming; one who feigns to be other and better than he is; a false pretender to virtue or piety; one who simulates virtue or piety.
Thesaurus Entries
Holy Willie, Joseph Surface, Mawworm, Pecksniff, Pharisee, Tartuffe, actor, affecter, ape, attitudinizer, bluffer, canter, canting hypocrite, charlatan, con man, confidence man, conformist, copier, copycat, copyist, counterfeiter, cuckoo, deceiver, dissembler, dissimulator, double-dealer, echo, echoer, echoist, fair-weather friend, faker, false friend, flimflam man, flimflammer, forger, formalist, fraud, humbug, imitator, impersonator, imposter, impostor, liar, lip server, lip worshiper, masquerader, mealymouth, mime, mimer, mimic, mimicker, mocker, mockingbird, monkey, mountebank, parrot, pharisee, phony, pietist, pious fraud, plagiarist, poll-parrot, polly, polly-parrot, poser, poseur, pretender, quack, ranter, religionist, religious hypocrite, sanctimonious fraud, sham, sheep, simulator, sniveler, snuffler, spiritual humbug, summer soldier, whited sepulcher