Jamieson, Fausset and Brown on Isaiah 32:4

4. rash--rather, "the hasty"; contrast "shall not make haste" (Is 28:16); the reckless who will not take time to weigh religious truth aright. Or else, the well-instructed [Horsley].

stammers--those who speak confusedly on divine things (compare Ex 4:10-12; Jr 1:6; Mt 10:19, 20). Or, rather, those drunken scorners who in stammering style imitated Isaiah's warnings to mock them [Maurer] (Is 28:7-11, 13, 14, 22; 29:20); in this view, translate, "speak uprightly" (agreeably to the divine law); not as English Version, referring to the distinctness of articulation, "plainly."