Isaiah 33:19 New English Translation

¹⁹You will no longer see a defiant^[a] people
whose language you do not comprehend,^[b]
whose derisive speech you do not understand.^[c]

Isaiah 33:19 tn The Hebrew form נוֹעָז (noʿaz) is a Niphal participle derived from יָעַז (yaʿaz, an otherwise unattested verb) or from עָזָז (ʿazaz, “be strong,” unattested elsewhere in the Niphal). Some prefer to emend the form to לוֹעֵז (loʿez) which occurs in Ps 114:1 with the meaning “speak a foreign language.” See HALOT 809 s.v. עזז, 533 s.v. לעז. In this case, one might translate “people who speak a foreign language.”
Isaiah 33:19 tn Heb “a people too deep of lip to hear.” The phrase “deep of lip” must be an idiom meaning “lips that speak words that are unfathomable [i.e., incomprehensible].”
Isaiah 33:19 tn Heb “derision of tongue there is no understanding.” The Niphal of לָעַג (laʿag) occurs only here. In the Qal and Hiphil the verb means “to deride, mock.” A related noun is used in 28:11.

New English Translation (NET)