ἀνυπέρεκτος
From LSJ
θεωρεῖται δὲ ἀνοησίᾳ κρείττονι νοήσεως → it is grasped only by means of an ignorance superior to intellection, it may be immediately cognised only by means of a non-intellection superior to intellection
English (LSJ)
ον,
A unsurpassable, ἀκρότης Phld.D.3.5.
Spanish (DGE)
-ον insuperable, ἀκρότης Phld.D.3.5.27.