бдительный

From LSJ

οὐδεὶς ἔστη παρὰ τῷ λέοντι ἡμᾶς φοβήσαντι → no one stood near the lion because it had frightened us

Source

Russian > Greek

ἄγρυπνος, ἀγρυπνητικός, πολύπλανος