δυσθεώρητος
From LSJ
Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται → For extreme diseases, extreme methods of cure, as to restriction, are most suitable.
English (LSJ)
ον,
A hard to observe, Arist.HA511b13; scarcely visible, τρύπημα Hero Spir.1.31, cf. Philum.Ven.15.6. II hard to understand or reduce to theory, τέχνη Ph.Bel.49.19, cf. Plb.3.31.7, Phld.Rh.1.141 S., Ph.2.84.