voluntarily(in a voluntary manner) adverb [UK: ˈvɒ.lən.trə.li] [US: ˌvɑː.lən.ˈte.rə.li]John did it voluntarily. = John lo hizo voluntariamente.
involuntariamenteadverb
involuntarily(in an involuntary manner) adverb [UK: ɪn.ˈvɒ.lən.trə.li] [US: ˌɪn.ˌvɑː.lən.ˈtɜː.rə.li]John was involuntarily conscripted into the military. = John fue reclutado involuntariamente por el ejército.
unintentionally(in an unintentional manner) adverb [UK: ˌʌ.nɪn.ˈten.ʃnə.li] [US: ˌʌ.ˌnɪn.ˈten.ʃə.nə.li]A gentleman is one who never hurts anyone's feelings unintentionally. = Un caballero es alguien que nunca hiere los sentimientos de otra persona involuntariamente.