From Longman Dictionary of Contemporary Englishfrown on/upon somebody/something phrasal verbDISAPPROVEto disapprove of someone or something, especially someone’s behaviour Even though divorce is legal, it is still frowned upon. → frown→ See Verb table
Examples from the Corpus
frown on/upon • Other pesticides are legal, but frowned upon.• Working mothers are frowned upon, and their children are less likely to be accepted by elite schools.• Divorce in many communities was allowed, though frowned upon and usually had less to do with incompatibility than with infertility.• None doubted his ability, but Hardaker frowned upon his frankness.• Debauchery is not exactly frowned upon in the court of the pleasure-loving King Charles.• But single women don't frown on married life.• Inheriting money, the gentle practice of gentlemen and the upper classed for centuries is now frowned upon or outright criticised.• Barry had always frowned on those who had affairs. 