Following are a number of back-translations as well as a sample translation for translators of Jeremiah 51:18:

• Kupsabiny: “They have no goodness at all,
  and it is fitting for them to be mocked.
  God will destroy (them)
  when he comes to pronounce judgment on them.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “They are worthless, and an-object-of-scorn. Time will-come that they all be destroyed.” (Source: Hiligaynon Back Translation)