voluntario
From LSJ
οὕτως ἐξ ἐχθρῶν αὐτοκτόνα πέμπετο δῶρα, ἐν χάριτος προφάσει μοῖραν ἔχοντα μόρου → thus mutual gifts that bring death were bestowed by enemies, gifts that brought the lot of death in the name of a favor
Spanish > Greek
ἐθελητός, αὐτόγνωτος, ἐθελουργός, ἑκών, ἐθελούσιος, ἀνυπαναγκαῖος, ἀπαράκλητος, ἑκούσιος, ἐθελοντής, αὐθαίρετος, ἐθελοντήρ, ἐθελόντιος, βολουντάριος, αὐθεκούσιος, αὐτοκελής, ἑκοντής