ἀξύμβλητος
From LSJ
ὃν οὐ τύπτει λόγος οὐδὲ ῥάβδος → if words don't get through, neither a beating will | if the carrot doesn't work, the stick will not work either | whom words do not strike, neither does the rod
French (Bailly abrégé)
v. ἀσύμβλητος.
English (Woodhouse)
(see also: ἀσύμβλητος) dark, obscure, undiscoverable, enigmatic, hard to understand, hard to unravel, not clear, not to be discovered
German (Pape)
v. ἀσύμβλητος.