na.vav describes something hollow in construction and, in Job, a hollow man.

The predominant use describes constructed objects as hollow: an altar made with boards or tablets and a pillar with stated thickness. Job 11:12 applies the same form to a man in a comparison about gaining understanding, presenting a rarer personal use.

1. Hollow construction · dominant

   In Exodus 27:8 the Qal passive participle occurs in instructions for making the altar with boards, and the APB renders the clause “make it hollow with boards.” In Exodus 38:7 the completed altar is described as made of “hollow tablets,” while Jeremiah 52:21 describes a pillar whose thickness is given and then calls it “hollow.”

   Exodus 27:8Exodus 38:7Jeremiah 52:21
2. A hollow man · rare

   In Job 11:12 the Qal passive participle describes a man in the clause about gaining understanding; the APB renders the opening as “A hollow man gains understanding.” The verse's comparison with a wild-donkey colt marks this as a personal, rather than architectural, application.

   Job 11:12

In the Anselm Project Bible: The APB uses “hollow” in all four verses, applying it to boards or tablets, a pillar, and a man. These renderings confirm the clauses' presentation without fixing every nuance of the Hebrew term.