Following are a number of back-translations as well as a sample translation for translators of Proverbs 26:5:

• Kupsabiny: “Tell a foolish person words that will expose his foolishness,
  and then he will know that he actually knows nothing.” (Source: Kupsabiny Back Translation)
• Newari: “If you answer the question of a fool
  he will be confirmed in thinking that he is wise.” (Source: Newari Back Translation)
• Hiligaynon: “But sometimes it is good if you (sing.) answer him, so-that he will-know that he is not wise like what he thinks.” (Source: Hiligaynon Back Translation)
• Kankanaey: “If you (sing.) answer a foolish-person, suit your (sing.) words to his foolishness so that he has a way to understand that he is not wise.” (Source: Kankanaey Back Translation)
• English: “If you give a foolish answer to someone who asks a foolish question,
  he will realize that he is not very wise/foolish.” (Source: Translation for Translators)