The Hebrew adjective nachuwsh means "of bronze" or "bronze-like." It describes something made of or resembling bronze (copper alloy). The word is related to nechosheth (H5178, bronze/copper) and conveys the qualities of strength, durability, and imperviousness associated with this important ancient metal.
Bronze in Scripture symbolizes strength, endurance, and divine judgment. The bronze altar, bronze laver, and bronze serpent all carried deep theological meaning. When used to describe the heavens becoming like bronze (in covenant curses), it depicted God withholding rain as judgment for disobedience. The hardness and impenetrability of bronze powerfully illustrates both God's unyielding justice and His enduring faithfulness.