imborrable
From LSJ
ἑτέρως ἠδύνατο βέλτιον ἢ ὡς νῦν ἔχει κατεσκευάσθαι → otherwise they could have been constructed better than they are now (Galen, On the use of parts of the body 4.143.1 Kühn)
Spanish > Greek
ἀναπόνιπτρος, ἀναπότριπτος, ἀνέκνιπτος, ἀνέκπλυτος, ἀνέκρυπτος, ἀνέκτριπτος, ἀνεξάλειπτος, ἀνεξάλεπτος, ἀνεξίτηλος, ἀνυφαίρετος, δευσοποιός, δυσαπότριπτος, δυσεκκάθαρτος, δυσέκνιπτος, δυσέκπλυτος, δύσνιπτος, ἔμμονος