If you describe someone as holier-than-thou, you disapprove of them because they seem to believe that they are more religious or have better moral qualities than anyone else. adj
He has always sounded holier-than-thou.
Translation English Cobuild Collins Dictionary
goody-goody (informal) pietistic, pietistical, priggish, religiose, sanctimonious, self-righteous, self-satisfied, smug, squeaky-clean, unctuous
English Collins Dictionary - English synonyms & Thesaurus
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