impossibility
From LSJ
Εὑρεῖν τὸ δίκαιον πανταχῶς οὐ ῥᾴδιον → Difficile inventu est iustum, ubi ubi quaesiveris → Zu finden, was gerecht ist, ist durchaus nicht leicht
subs. P. and V. ἀπορία, ἡ. Impossibilities: P. and V. ἄπορα, τά, ἀδύνατα, τά, ἀμήχανα, τά (rare P.).