52notοὐforγὰρthey understoodσυνῆκανbyἐπὶtheτοῖςloavesἄρτοις,butἀλλ’had beenἦνof themαὐτῶνtheἡheartκαρδίαhardenedπεπωρωμένη.
For they did not understand about the loaves, but their heart was hardened.
πεπωρωμένη
πωρόω
I harden, render callous