Following are a number of back-translations as well as a sample translation for translators of Proverbs 21:29:

• Kupsabiny: “A crooked person is dry-headed (stubborn/unresponsive),
  but the upright, plans for/prepares his ways/paths.” (Source: Kupsabiny Back Translation)
• Newari: “The wicked might boast.
  But the righteous only act
  according to their conscience.” (Source: Newari Back Translation)
• Hiligaynon: “A wicked man is not concerned with what he does, but a righteous on-the-other-hand he thinks carefully what he does.” (Source: Hiligaynon Back Translation)
• Kankanaey: “A sinner boasts-about his ability, but the righteous-one thinks properly about what he does.” (Source: Kankanaey Back Translation)
• English: “Wicked people pretend that they know everything,
  but righteous people think carefully about what will happen because of what they do.” (Source: Translation for Translators)