And he dwelleth in desolate cities, and in houses which no man inhabiteth, which are ready to become heaps.
The class of wicked here described is that of robbers who plunder "cities," and seize on the houses of the banished citizens (Isaiah 13:20), that they may be placed alone in the midst of the earth (Isaiah 5:8). Eliphaz chooses this class because Job had chosen the same (Job 12:6).
Heaps - of ruins.