ἀκαταλλάκτως

From LSJ

Ἀναξαγόρας δύο ἔλεγε διδασκαλίας εἶναι θανάτου, τόν τε πρὸ τοῦ γενέσθαι χρόνον καὶ τὸν ὕπνονAnaxagoras used to say that we have two teachers for death: the time before we were born and sleep | Anaxagoras said that there are two rehearsals for death: the time before being born and sleep

Source

Russian (Dvoretsky)

ἀκαταλλάκτως: непримиримо (πολεμεῖν Dem.): ἀ. πρός τινα ἔχειν Polyb. непримиримо относиться к кому-л.

Spanish

irreconciliablemente