συνετή

From LSJ

καὶ ὑποθέμενος κατὰ τῆς κεφαλῆς φέρειν τὰς πληγάς, ὡς ἐν ἐκείνῃ τοῦ τε κακοῦ τοῦ πρὸς ἀνθρώπους → and having instructed them to bring their blows against the head, seeing that the harm to humans ... (Josephus, Antiquities of the Jews 1.50)

Source

Russian (Dvoretsky)

συνετή: ἡ (sc. ἡλικία) разумный, т. е. зрелый возраст Anth.