Definition of holier-than-thou adjective from the Oxford Advanced Learner's Dictionary

 

holier-than-thou

 adjective
adjective
BrE BrE//ˌhəʊliə ðən ˈðaʊ//
 
; NAmE NAmE//ˌhoʊliər ðən ˈðaʊ//
 
(disapproving)
 
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showing that you think that you are morally better than other people synonym self-righteous I can't stand his holier-than-thou attitude.
See the Oxford Advanced American Dictionary entry: holier-than-thou