οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
adj.
P. and V. οὐ διδακτός.
Slow at learning: Ar. and P. δυσμαθής; see dull.