inviolable(not violable; not to be infringed) adjective [UK: ɪn.ˈvaɪə.ləb.l̩] [US: ˌɪn.ˈvaɪə.ləb.l̩]
sacrosanct(beyond alteration, criticism, or interference, especially due to religious sanction; inviolable) adjective [UK: ˈsæ.krəʊ.sæŋkt] [US: ˈsækro.ʊ.sæŋkt]