ἀμετανόησις

From LSJ

κέρκος τῇ ἀλώπεκι μαρτυρεῖ → you can tell a fox by its tail, small traits give the clue to the character of a person

Source

Spanish (DGE)

-εως, ἡ falta de arrepentimiento Ephr.Syr.2.204D.