τοπαστέον
From LSJ
Ἔοικα γοῦν τούτου γε σμικρῷ τινι αὐτῷ τούτῳ σοφώτερος εἶναι, ὅτι ἃ μὴ οἶδα οὐδὲ οἴομαι εἰδέναι → I seem, then, in just this little thing to be wiser than this man at any rate, that what I do not know I do not think I know either
English (LSJ)
(τοπάζω) one must conjecture, Hsch.
Greek (Liddell-Scott)
τοπαστέον: ῥηματ. ἐπίθ. τοῦ τοπάζω, δεῖ τοπάζειν, «τοπαστέον· ὑποληπτέον, ὑπονοητέον» Ἡσύχ.