1)
Will Hashem literally feed them wormwood?
1.
Radak: He will bring on them an affliction as bitter as wormwood.
2)
What is "Chanufah"?
1.
Radak: It is evil and favoritism. They praise their evil deeds, and do not rebuke them.
2.
Malbim: He says with his mouth the opposite of his heart.
3)
What is "l'Chol ha'Aretz"?
1.
Radak: It is all of Eretz Yehudah.