adjective / adverb
incommunicado
in-kuh-myoo-nih-KAH-doh/ˌɪnkəˌmjuːnɪˈkɑːdəʊ/
Without communication with other people.
The officer blocks the detained man's telephone access, keeping him incommunicado.

Etymology
Communicare pictures communication as sharing or making something common. The negative prefix marks being cut off from that exchange, whether unable to contact others or forbidden to do so.
In context
I was then transferred to another place, where it was incommunicado. It was not the secret detention houses, the torture houses, but it was like a prison, but nobody knew.
More examples
- She remained incommunicado during the remote expedition.
- For two days the missing travelers were incommunicado.
- Officials refused to explain why he was kept incommunicado.
Forms
incommunicado
Similar words
- isolated
- Isolated can mean physically apart; incommunicado specifically means unable to communicate with others.
- unreachable
- Unreachable means not contactable; incommunicado can emphasize imposed denial of communication.