ἀδοκήτως
From LSJ
καλῶς δρῶν ἐξαμαρτεῖν μᾶλλον ἢ νικᾶν κακῶς → I would prefer to fail with honor than to win by evil | I prefer to fail by acting rightly rather than win by acting wrongly | Better fail by doing right, than win by doing wrong (Sophocles, Philoctetes 95)
French (Bailly abrégé)
adv.
à l'improviste.
Étymologie: ἀδόκητος.
Russian (Dvoretsky)
ἀδοκήτως: неожиданно (εὐτυχῆσαι Thuc.).
Spanish
Lexicon Thucydideum
praeter opinionem, beyond expectation, 3.45.6, 4.17.4.