γνοίης ὅσσον ὄνων κρέσσονες ἡμίονοι → you know how much better are donkeys from mules
weltklug, rerum od. rerum humanarum prudens. rerum humanarum gnarus od. peritus. morum peritus (der Weltkenntnis hat). – callidus. versutus (gescheit, schlau übh.).