dissembler dissembler /dɪˈsɛmblər/

noun

1. 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  ( dissembler , dissimulator , phoney , hypocrite , phony [ N. American] , pretender )
   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
     Despite his public stance on honesty, John was a hypocrite who lied frequently.
   Despite his public stance on honesty, John was a hypocrite who lied frequently.