"Remain incommunicado" is a common phrase used to describe a situation where an individual is isolated from communication. When someone is incommunicado, they are cut off from the rest of the world and cannot be contacted or reached out to. However, there are many other synonyms that can be used to describe this state of isolation, such as being secluded, inaccessible, closed off, or out of reach. These synonyms imply a sense of detachment from society, often due to their own choice or circumstances beyond their control. Regardless of the reason for their isolation, these synonyms indicate that the individual is not to be disturbed or interrupted and should be allowed to remain in their solitude.