εὐκέφαλος
From LSJ
μὴ ἐν πολλοῖς ὀλίγα λέγε, ἀλλ΄ ἐν ὀλίγοις πολλά → don't say little in many words, but much in a few words (Stobaeus quoting Pythagoras)
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.