ἀπροόπτως
From LSJ
Δύο γὰρ, ἐπιστήμη τε καὶ δόξα, ὧν τὸ μὲν ἐπίστασθαι ποιέει, τὸ δὲ ἀγνοεῖν → Two different things are science and belief: the one brings knowledge, the other ignorance
French (Bailly abrégé)
adv.
à l’improviste.
Étymologie: ἀπρόοπτος.
Russian (Dvoretsky)
ἀπροόπτως: неожиданно, внезапно Plut.