incommunicado
/ˈɪnkəˌmjuːnɪˈkɑːdəʊ/adjective
- not able, wanting, or allowed to communicate with other people无法（或不愿、不得等）与他人沟通的：
they were separated and detained incommunicado.
他们被分开拘留, 不得与外人沟通。
词源
mid 19th cent.: from Spanish incomunicado， past participle of incomunicar 'deprive of communication'.