Following are a number of back-translations as well as a sample translation for translators of Proverbs 11:12:

• Kupsabiny: “A person without wisdom despises/insults (others),
  but a wise person keeps/restrains his mouth.” (Source: Kupsabiny Back Translation)
• Newari: “Only fools belittle their neighbors.
  [But] people with insight remain silent.” (Source: Newari Back Translation)
• Hiligaynon: “A man without understanding mocks his fellowman, but a man who has understanding does not mock.” (Source: Hiligaynon Back Translation)
• Kankanaey: “The one who mocks/belittles his neighbor is mindless (lit. has no mind/thoughts). The thinking/reflective-one, he-remains-quiet.” (Source: Kankanaey Back Translation)
• English: “It is foolish to despise others;
  those who have good sense/are wise do not say anything to criticize others.” (Source: Translation for Translators)