φαυλουργός
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)
όν,
A working ill, Ar.Fr.882: cf. φλαυρουργός.
German (Pape)
[Seite 1259] όν, schlechte, geringe Arbeit machend, schlechter Arbeiter, Schol. Soph. Phil. 31.