ἀγνωμοσία

From LSJ

πρέπει γὰρ τοὺς παῖδας ὥσπερ τῆς οὐσίας οὕτω καὶ τῆς φιλίας τῆς πατρικῆς κληρονομεῖν → it is right that children inherit their fathers' friendships just as they would their possessions

Source

Spanish (DGE)

-ας, ἡ insensatez, imprudencia Tz. en An.Ox.4.115.5.