sanctimonious
1. [ adjective ] (religion) excessively or hypocritically pious
Synonyms: pietistic pietistical pharisaic pharisaical self-righteous holier-than-thou
Examples:

"a sickening sanctimonious smile"

Related terms: pious
Similar spelling:   sanctimoniously
  sanctimony
  sanctioning
  sanctionative
  sanctioned
  sanctified