ἀγαστός
οὐκ ἂν λάβοις παρὰ τοῦ μὴ ἔχοντος → you can't take from one who doesn't have, you can't squeeze blood out of a turnip, you can't get blood out of a turnip, you can't get blood from a stone, you can't get blood out of a stone
English (LSJ)
ή, όν, (ἄγαμαι) later form of Hom. ἀγητός,
A admirable, A.Fr.268; οὐκέτι μοι βίος ἀ. E.Hec.168; ἐκεῖνο δὲ κρίνω τοῦ ἀνδρὸς ἀ. X.HG2.3.56, cf. An.1.9.24, Plu.Aem.22, Procop.Aed.1.4. Adv. -τῶς, prob. in S.Ichn.243, cf. X.Ages.1.24. (Pure Att. θαυμαστός.)
German (Pape)
[Seite 9] adj. verb. zu ἄγαμαι, bewundernswürdig. Ggstz. οὐ θαυμαστόν Xen. Anab. 1, 9, 24; μεμπτόν Plut. Cat. mai. 24; verb. mit τίμιος Plat. Leag. VII, 868 c. – Adv. ἀγαστῶς, Xen. Ages. 1, 24.
Greek (Liddell-Scott)
ἀγαστός: -ή, -όν, (ἄγαμαι) ἄξιος θαυμασμοῦ, μεταγ. τύπος τοῦ Ὁμηρ. ἀγητός, θαυμαστός, Αἰσχύλ. Ἀπόσπ. 265· οὐκέτι μοι βίος ἀγ. Εὐρ. Ἑκ. 169· ἐκεῖνο δὲ κρίνω τοῦ ἀνδρὸς ἀγ., Ξεν. Ἑλλ. 2. 3, 56, πρβλ. Ἀν. 1. 9, 24, Οἰκ. 11. 19, Ἱππ. 11. 9, συχνὰ παρὰ Πλουτ. - Ἐπίρρ. -τῶς, Ξεν. Ἀγησ. 1. 24. - Παρ’ ἄλλοις Ἀττ. συγγραφ. ἡ λ. θαυμαστὸς προτιμᾶται.