ἀφράστως
From LSJ
ὄρνιθι γὰρ καὶ τὴν τότ᾽ αἰσίῳ τύχην παρέσχες ἡμῖν → for it was by a good omen that you provided that past fortune to us
French (Bailly abrégé)
adv.
sans réflexion, à l’improviste.
Étymologie: ἄφραστος.
Russian (Dvoretsky)
ἀφράστως: непредвиденно, неожиданно (ἀ. ἀέλπτως τε Soph.).