holier-than-thou

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌholier-than-ˈthou adjective  GOOD/MORALshowing that you think you are morally better than other people – used to show disapproval 自命清高的，道德上自视甚高的〔含贬义〕 SYN self-righteous

Examples from the Corpus

holier-than-thou• I know he doesn't smoke or drink but I wish he wasn't so holier-than-thou.• a holier-than-thou attitude• She was intensely irritated by Emma's holier-than-thou attitude.

ˌholier-than-ˈthou adjectiveChineseSyllable  

think showing that than Corpus morally you you are better

holier-than-thou
ˌholier-than-ˈthou adjective
showing that you think you are morally better than other people – used to show disapproval
   SYN  self-righteous

holier-than-thouBrE /ˌhəʊliə ðən ˈðaʊ/ 🔊NAmE /ˌhoʊliər ðən ˈðaʊ/ 🔊 adjective (disapproving) showing that you think that you are morally better than other people 自命清高的 SYN self-righteous ◆I can't stand his holier-than-thou attitude. 我无法忍受他那种自命不凡的态度。🔊🔊