Jamieson, Fausset and Brown on Isaiah 29:9

9. Stay--rather, "Be astounded"; expressing the stupid and amazed incredulity with which the Jews received Isaiah's announcement.

wonder--The second imperative, as often (Is 8:9), is a threat; the first is a simple declaration of a fact, "Be astounded, since you choose to be so, at the prophecy, soon you will be amazed at the sight of the actual event" [Maurer].

cry ... out ... cry--rather, "Be ye blinded (since you choose to be so, though the light shines all round you), and soon ye shall be blinded" in good earnest to your sorrow [Maurer], (Is 6:9, 10).

not with wine--but with spiritual paralysis (Is 51:17, 21).

ye ... they--The change from speaking to, to speaking of them, intimates that the prophet turns away from them to a greater distance, because of their stupid unbelief.