εὐκέφαλος
From LSJ
ἵνα οὖν μηδ' ἐν τούτῳ δῷ αὐτοῖς λαβήν (Photius, Fragments on the Epistle to the Romans 483.26) → so that he doesn't give them even here a handle (= an opportunity for refutation)
English (LSJ)
ον, A with a good head, Arr.Cyn.4.4 (del. Hercher), Poll. 2.43, Hippiatr.115.
German (Pape)
[Seite 1074] mit gutem Kopf, Arr. cyn. 4, 4.
Greek (Liddell-Scott)
εὐκέφᾰλος: -ον, καλὴν ἔχων κεφαλήν, Ἀρρ. Κυν. 4. 4.