ἀλαζονεύεσθαι
From LSJ
Ἓν οἶδα, ὅτι οὐδὲν οἶδα → I know only one thing, that I know nothing | all I know is that I know nothing.
Greek > English (Woodhouse Verbs Reversed)
(see also ἀλαζονεύομαι): boast, impose, be a cheat, be a quack, make pretensions