ἡμικεφάλαιον
From LSJ
κακὸς μὲν γὰρ ἑκὼν οὐδείς → no one is voluntarily wicked, no one is voluntarily bad
English (LSJ)
[ᾰ], τό, less Att. form for ἡμίκρανον (i.e. ἡμίκραιρα), acc. to Phryn.303:
German (Pape)
[Seite 1168] τό, Hesych., von Phryn. 328 verworfen, gegen ἡμίκρανον.