μυστηριώδης
From LSJ
Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται → But for extreme illnesses, extreme remedies, applied with severe exactitude, are the best (Hippocrates, Aphorism 6)
English (LSJ)
ες,
A like mysteries, τελεταί Plu.2.10e, cf. 996b; διαπράττεσθαι τὰ μ. πράγματα (euphem.) Steph.in Hp.1.100 D.; of a remedy, Alex.Trall.1.15.
German (Pape)
[Seite 223] ες, mysterienartig, Plut. de esu carn. 1 E.