уверенный

From LSJ

Ἄνθρωπος ὢν ἥμαρτον· οὐ θαυμαστέον → Being human I made a mistake; there is nothing remarkable about it.

Menander, Fragmenta, 499

Russian > Greek

πιστός, ἀτρεκής, βέβαιος, ἀπτώς, θαρσαλέος, θαρραλέος