ἀμετανόησις

From LSJ

μὴ ἐν πολλοῖς ὀλίγα λέγε, ἀλλ΄ ἐν ὀλίγοις πολλά → don't say little in many words, but much in a few words (Stobaeus quoting Pythagoras)

Source

Spanish (DGE)

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