Incommunicado

Adjective

 * 1) In a state or condition in which one is unable or unwilling to communicate.
 * 2) * 2007, "Dreadful news awaits housemate", Times Online, London, 25 May (retrieved 29 June 2007),
 * The father of a woman living in the incommunicado world of the Big Brother house in Australia has died but his daughter has not been told.

Adverb

 * 1) In a manner in which communication with outsiders is not possible, for either voluntary or involuntary reasons, especially due to confinement or reclusiveness.
 * 2) * 2004, Ben Westhoff, "Making Traks," Riverfront Times, St. Louis MO, 7 Apr,
 * The Starz seem most comfortable when they're in the studio, where they can work incommunicado.

Thesaurus
abstruse, beclouded, blind, buried, close, clouded, concealed, covered, covert, eclipsed, hid, hidden, in a cloud, in a fog, in eclipse, in purdah, in the wings, latent, mysterious, obfuscated, obscure, obscured, occult, recondite, secluded, secluse, secret, sequestered, under an eclipse, under cover, under house arrest, under wraps, underground, unknown, wrapped in clouds

Etymology
From incomunicado "incommunicado", with spelling influenced by that of such English words as communicate.