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δυσεισποίητος

From LSJ

Ἓν οἶδα, ὅτι οὐδὲν οἶδα → I know only one thing, that I know nothing | all I know is that I know nothing.

Diogenes Laertius, Lives of the Philosophers, Book 2 sec. 32.

Spanish (DGE)

-ον
difícil de conseguir τὰ ... λίαν ὑπερφυᾶ Cyr.Al.Dial.Trin.387a.