εθελόσοφος

From LSJ

λέγεις, ἃ δὲ λέγεις ἕνεκα τοῦ λαβεῖν λέγεις → you speak, but you say what you say for the sake of gain (Menander, fr. 776)

Source

Greek Monolingual

ἐθελόσοφος, -ον (Α)
αυτός που πιστεύει αστήριχτα ότι είναι σοφός.