δύσβλεπτος
From LSJ
ἄλογον δὴ τὸ μήτε μάχης ἄρξασθαι μήτε τοὺς φίλους φυλάξαι, ἐὰν ὑπό γε τῶν βαρβάρων ἀδικῆσθε → It is irrational neither to begin battle nor to guard the friends, if you are ever wronged by the foreigners
Spanish (DGE)
-ον
difícil de ver, poco visible glos. a δυσδερκής Sch.Opp.C.1.102, 450.