διαγνώστης
From LSJ
μὴ κακὸν εὖ ἔρξῃς· σπείρειν ἴσον ἔστ' ἐνὶ πόντῳ → do no good to a bad man; it is like sowing in the sea
English (LSJ)
διαγνώστου, ὁ, examining magistrate, = Lat. cognitor, Glossaria.
Spanish (DGE)
-ου, ὁ magistrado encargado de examinar las sentencias, Gloss.2.270.
German (Pape)
ὁ, der Entscheidende.