ἀπροόπτως
From LSJ
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
French (Bailly abrégé)
adv.
à l'improviste.
Étymologie: ἀπρόοπτος.
Russian (Dvoretsky)
ἀπροόπτως: неожиданно, внезапно Plut.