Isaiah 33:19

You will not look upon a shameless people, a people of exalted words. For you are not able to understand the dissertation of a tongue in which there is no wisdom

Other versions

King James Version

Thou shalt not see a fierce people, a people of a deeper speech than thou canst perceive; of a stammering tongue, that thou canst not understand.

English Standard Version

You will see no more the insolent people, the people of an obscure speech that you cannot comprehend, stammering in a tongue that you cannot understand.

New International Version

You will see those arrogant people no more, those people of an obscure speech, with their strange, incomprehensible tongue.