NET
6 not to many peoples of unintelligible speech and difficult language, whose words you cannot understand. Surely if I had sent you to them, they would listen to you!
Darby
6 not to many peoples of strange language and of difficult speech, whose words thou canst not understand: had I sent thee to them, would they not hearken unto thee?
KJV
6 Not to many people of a strange speech and of an hard language, whose words thou canst not understand. Surely, had I sent thee to them, they would have hearkened unto thee.