αγαθούλης

From LSJ

ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers

Source

Greek Monolingual

-ούλα, -ούλικο αγαθός
αυτός που κουτοφέρνει, αφελής, αγαθιάρης.