ἀνιγρός
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)
ά, όν,
A = ἀνιαρός 1, Nic.Th.8, Call.Iamb.1.164 (prob.), Opp. H.3.188; νοῦσος Call.Aet.3.1.14; cf. ἀνιγρόν· ἀκάθαρτον, φαῦλον, κακόν, δυσῶδες, ἀσεβές, Hsch.; ἀ. ἀντίπαλοι AP7.561 (Jul. Aegypt.); δαίμων IG14.2123.