What is the meaning of "v'Ne'esfah Simchah"?
Rashi: Simchah ceased; it is not seen. Radak - this is like "Asof Asifem" (8:13).
Radak: It will be gathered from them to only one place.
Malbim: They will not harvest grain at all. Refer to 48:33:4:2.
Why does it mention Karmel?
Radak: It was a place of seeded fields and fruits trees.
Who will not stomp?
Radak: The one who stomps. It is omitted here, but it is written in Yeshayah (16:10).
What is "Heidad"?
Rashi: They used to shout Heidad amidst Simchah, while stomping grapes. Now they will shout it when fleeing the sword. Radak - Yonasan translated, they will not stomp, and will not raise their voices.
Malbim: At the time of stomping, they will shout this to invigorate themselves for war.