уверенно
From LSJ
κοινὴ γὰρ ἡ τύχη καὶ τὸ μέλλον ἀόρατον → fortune is common to all, the future is unknown | fortune is common to all and the future unknown | fate is common to all and the future unknown
Russian > Greek
πιστευτικῶς, ἀπταίστως, ἔμπεδον, ἐμπέδως, πεπεισμένως, θαρσαλέως, θαρραλέως, ἀπτώτως, βεβαίως, τεθαρρηκότως, σάφα