μὴ κακὸν εὖ ἔρξῃς· σπείρειν ἴσον ἔστ' ἐνὶ πόντῳ → do no good to a bad man; it is like sowing in the sea
ἄφατος, ἀπευθής, ἀνάγγελος, ἐπίσκιος, ἀκήρυκτος, ἄσημος, ἄρρητος, ἄπυστος, ἀκλεής, ἀκλειής, νώνυμος, ψεφηνός