The previous shloka described the casting into demonic births. This one traces the trajectory further. These deluded people, janmani janmani — birth after birth — keep receiving demonic births. One life of cruelty leads to the next life in darker circumstances, which breeds more cruelty, which brings an even darker birth. A whirlpool that pulls deeper with every rotation.
The most painful detail: mam aprapya eva — without ever reaching Me. The highest purpose of human life, according to the Gita, is to realize the Lord. These people miss that destination entirely. Not once, but across lifetime after lifetime. The opportunity keeps arriving, and they keep missing it.
Finally, they go to adhamam gatim — the lowest possible state. This is the chapter's gravest warning. Krishna delivers it directly to Arjuna, calling him Kaunteya (son of Kunti), as if to say: understand this clearly, and make sure you never go down this road.