Very well then, with foreign lips and strange tongues God will speak to this people
NIV
No, but [the Lord will teach the rebels in a more humiliating way] by men with stammering lips and another tongue will He speak to this people [says Isaiah, and teach them His lessons].
AMP
For with stammering lips and another tongue will he speak to this people.
KJV
You will see those arrogant people no more, people whose speech is obscure, whose language is strange and incomprehensible.
NIV
You will see no more the fierce and insolent people, a people of a speech too deep and obscure to be comprehended, of a strange and stammering tongue that you cannot understand.
AMP
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.
KJV