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
Plato, Apology 21dGreek (Liddell-Scott)
ἄοιστος: -ον, ἀφόρητος, Αἰσχύλ. Ἱκ. 881, καθ’ Ἕρμ. ἀντὶ ἄϊστος.