καρτερικός
From LSJ
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,
A capable of endurance, patient, Amips.9, Isoc.8.109, etc.; πρὸς Χειμῶνα X.Mem.1.2.1 (Sup.); ῥώμη κ. πρὸς ἀρετήν Pl.Def.412a: Sup., Luc.Anach.38; opp. μαλακός and distd. from ἐγκρατής (cf. καρτερία), Arist.EN1150a33. Adv. -κῶς ib. 1179b33, Marin.Procl.12.