adjective/boluntaˈɾjoso/
willing; willful
Etymology tree Spanish voluntario Proto-Indo-European *h₃ed- Proto-Indo-European *-os Proto-Indo-European *h₃édosder.? Proto-Italic *-ŏ̄dsos? Old Latin -ōssus Latin -ōsus Old Spanish -oso Spanish -oso Spanish voluntarioso From voluntario + -oso.