poroo describes becoming hardened in contexts of hearts or minds marked by lack of understanding or sight.

Across the supplied verses, the verb describes hearts, minds, or a group becoming hardened; the surrounding clauses connect this condition with not understanding, not seeing, or a veil remaining unlifted.

1. Hardening that obstructs understanding or sight · dominant

   In Mark 6:52, the perfect passive participle describes hearts in a clause explaining why the disciples did not understand about the loaves; in Mark 8:17, the accusative perfect passive participle occurs in the question about whether they yet understand or comprehend. The aorist forms likewise occur where minds have a veil remaining unlifted in 2 Corinthians 3:14, where eyes do not see and hearts do not understand in John 12:40, and where “the rest were hardened” in Romans 11:7.

   Mark 6:52Mark 8:172 Corinthians 3:14John 12:40Romans 11:7

In the Anselm Project Bible: The APB presents the condition with “hardened” for hearts, minds, and “the rest.” In John 12:40 it also places the clause alongside blinded eyes and an inability to see or understand; These surrounding expressions cannot all be assigned directly to the term.