Following are a number of back-translations as well as a sample translation for translators of Proverbs 30:12:

• Kupsabiny: “There are people who pretend to be holy/clean but (they are) bad even to being smelly (disgusting).” (Source: Kupsabiny Back Translation)
• Newari: “There is a kind of people who,
  though they are impure,
  think themselves very pure.” (Source: Newari Back Translation)
• Hiligaynon: “There are people that what they see of themselves (is) as truly perfection, but the truth is their lives are dirty.” (Source: Hiligaynon Back Translation)
• Kankanaey: “Some say that they have no sins even though they have-become-filthy from their sins.” (Source: Kankanaey Back Translation)