GNU Collaborative International Dictionary of English

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Found one definition

1.       
   holier-than-thou adj. being excessively or hypocritically pious while condemning others as being less virtuous than oneself.
   
   Syn. -- pietistic, pietistical, pharisaic, pharisaical, sanctimonious, self-righteous.
   
   [WordNet 1.5 +PJC]