ἀνεπίδηλος
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)
English (LSJ)
ον,
A not manifest or observable, Ptol.Harm.1.4.
Greek (Liddell-Scott)
ἀνεπίδηλος: -ον, ὁ μὴ ἐπίδηλος, ὁ μὴ φανερός, ἀπαρατήρητος, Πτολ. Μουσ. 1. 4.
Spanish (DGE)
-ον no observable τόποι Ptol.Harm.10.6.