pretender (n)
phony (n)
phoney (n)
hypocrite (n)
dissimulator (n)
dissembler (n)

Definition: 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

phony (a)
phoney (a)
fake (a)
bogus (a)
bastard (a)

Definition: fraudulent