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Adjective: holier-than-thou  ,how-lee-u(r)-dhun'dhaw
  1. Excessively or hypocritically pious
    "His holier-than-thou attitude alienated many of his colleagues";
    - pietistic, pietistical, pharisaic, pharisaical, sanctimonious, self-righteous

See also: pious

Encyclopedia: Holier-than-thou