ἀθανατικός

From LSJ

Ψεύδει γὰρ ἡ ‘πίνοια τὴν γνώμην → A second thought proves one's first thought false

Sophocles, Antigone, 389

Spanish (DGE)

-ή, -όν que hace inmortal subst. τὸ ἀ. Tz.Ex.150.26L.