Adam Clarke on Job 29:10

The nobles held their peace - Princes שרים sarim, and Nobles, נגידים negidim, must have been two different classes of the great men of Idumea. שר sar, Prince, director, or ruler, was probably the head of a township, or what we would call a magistrate of a particular district. נגיד nagid, a Noble, or one of those who had the privilege of standing before, or in the presence of, the chief ruler. The participle נגד neged is frequently used to signify before, in the presence of, publicly, openly. And on this account, it is most likely that the noun means one of those nobles or counsellors who were always admitted to the royal presence. Mr. Good thinks that renowned speakers or eminent orators are meant: and others have embraced the same opinion. Job here intimates that his judgment was so sound, his decisions so accredited, and his reasoning power so great, that every person paid him the utmost deference.