noun (n)

• a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives(noun.person)

  Synonym:
  dissembler, dissimulator, phoney, phony, pretender
  

  source: wordnet30
• 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.(noun)

  source: webster1913