Following are a number of back-translations as well as a sample translation for translators of Ecclesiastes 9:17:

• Kupsabiny: “One should listen to the words that wise people speak slowly instead of the noise/shouting of a foolish king.” (Source: Kupsabiny Back Translation)
• Newari: “Rather than heeding the words of a ruler of fools who shouts loudly,
  it is better to heed the humble words of one who is wise.” (Source: Newari Back Translation)
• Hiligaynon: “(It is) better to listen to the quiet word(s) of a wise man than to listen to the shout(s) of a foolish leader/[lit. head].” (Source: Hiligaynon Back Translation)
• English: “Speaking quietly what is very wise is much more sensible
  than a king shouting to foolish people.” (Source: Translation for Translators)