adversary [adversaries](opponent) noun [UK: ˈæd.və.sə.ri] [US: ˈæd.vər.ˌse.ri]In all matters of opinion, our adversaries are insane. = En toda materia de opinión, nuestros adversarios son dementes.
opponent [opponents](one who opposes another in words) noun [UK: ə.ˈpəʊ.nənt] [US: əˈpo.ʊ.nənt]He surprised his opponent. = Él sorprendió a su adversario.