incommunicado

He left town without telling even his wife where he was going and was incommunicado for several days.

The officers and privates were supposed to be strictly "incommunicado," but even these found means of communication.

So I did translate and they wanted to know if Marina was held incommunicado, and she answered.

I get the impression that The Brain keeps incommunicado purposely.

If we could have, we'd have even Introverted the Maintainer, broken all the ties that bind us, chanced it incommunicado.

How terrible it is one cannot realize until he has known those whose dear ones are confined incommunicado within that prison.