Английский словарь американских идиом - holier-than-thou

{adj.} Acting as if you are better than others in goodness, character, or reverence for God; acting as if morally better than other people. * /Most people find holier-than-thou actions in others hard to accept./ * /After Mr. Howard stopped smoking, he had a holier-than-thou manner toward his friends who still smoked./