What is "Zanach"?
Rid: He distanced. Palgei Mayim - this explains how Nochrim could conquer the Mikdash below, which is opposite the Mikdash above; Hashem distanced from the Mikdash above.
What is the meaning of "Ni'er"?
Rav Sadya Gaon: He darkened.
Rashi: He nullified. This is like "Ne'artah Bris Avdecha" (Tehilim 89:40).
Ibn Ezra: He abandoned or hated. The Nun is from the root.
Rid #1: He burned.
Rid #2: He distanced, like "Ne'artah Bris Avdecha."
What are "Chomos Armenoseha"?
Ibn Ezra: The walls of the Mikdash. Palgei Mayim - only the walls, empty of the Kedushah, was handed over to the Nochrim.
What is the comparison to "Yom Mo'ed"?
Rashi: People rejoiced and sang loudly on the festivals. So the enemies rejoiced loudly when they destroyed the Mikdash.
Ri Kara: The enemies raised their voices for evil when they entered to destroy the Mikdash, like the Leviyim used to raise their voices in song to praise Hashem.