holier-than-thou
adjective disapproving uk/ˌhəʊ.li.ə.ðənˈðaʊ/ us/ˌhoʊ.li.ɚ.ðənˈðaʊ/
自以为道德上高人一等的
People who are holier-than-thou think that they are morally better than anyone else.
Synonyms: sanctimonious self-righteous
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