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ἀπροόπτως

From LSJ

τὰν ἐπὶ τᾶς → Either with this or on this | Come back victorious or dead

Plutarch, Moralia, 241

French (Bailly abrégé)

adv.
à l'improviste.
Étymologie: ἀπρόοπτος.

Russian (Dvoretsky)

ἀπροόπτως: неожиданно, внезапно Plut.

Spanish

inconscientemente, inesperadamente, sin prever las consecuencias, de improviso