βολουντάριος

From LSJ

δι' ἐρημίας πολεμίων πορευόμενος → he marched on without finding any enemy, his route lay through a country bare of enemies

Source

Spanish (DGE)

-ου, ὁ voluntario τρίτος (sc. ὅρκος) ὁ βολουντάριος Steph.in Rh.296.33.