Aesopicus

From LSJ

μὴ κακὸν εὖ ἔρξῃς· σπείρειν ἴσον ἔστ' ἐνὶ πόντῳ → do no good to a bad man; it is like sowing in the sea

Source

Latin > English (Lewis & Short)

Aesōpĭcus: a, um, adj. Aesopus,
I Æsopic. Acc. to Isid. Orig. 1, 39, fables are either Æsopic or Libystic (from Libys, a writer of fables, mentioned by Hesych.); Æsopic, when brute beasts or things inanimate are represented as discoursing together; Libystic. when the discourse is between men and brutes.