ἀλαζονικῶς
From LSJ
Ὁ αὐτὸς ἔφησε τὸν μὲν ὕπνον ὀλιγοχρόνιον θάνατον, τὸν δὲ θάνατον πολυχρόνιον ὕπνον → Plato said that sleep was a short-lived death but death was a long-lived sleep
French (Bailly abrégé)
adv.
en fanfaron.
Étymologie: ἀλαζονικός.