voluntary
From LSJ
ἐν μὲν γὰρ εἰρήνῃ καὶ ἀγαθοῖς πράγμασιν αἵ τε πόλεις καὶ οἱ ἰδιῶται ἀμείνους τὰς γνώμας ἔχουσι διὰ τὸ μὴ ἐς ἀκουσίους ἀνάγκας πίπτειν → in peace and prosperity states and individuals have better sentiments, because they do not find themselves suddenly confronted with imperious necessities
English > Greek (Woodhouse)
adj.
Of things: P. and V. ἑκούσιος, αὐθαίρετος, V. ἑκών.
Of persons: P. and V. ἐθελοντής.