1)
What "Davar" reached the king?
1.
Radak: What the Navi called to the city.
2)
What is "Adarto"?
1.
Rashi citing Targum Yonasan: His honored garment.
2.
Radak: His royal robe.
3)
Why did the king do these actions?
1.
Malbim: He was aroused, and wanted to humble himself.