Synonyms and related words :
abstruse, arcane, beclouded, blind, buried, cabalistic, censored, classified, close, closed, clouded, concealed, covered, covert, cryptic, dark, eclipsed, enigmatic, esoteric, hermetic, hid, hidden, hush-hush, in a cloud, in a fog, in eclipse, in purdah, in the wings, incommunicado, latent, mysterious, obfuscated, obscure, obscured, occult, recondite, restricted, secluded, secluse, secret, sequestered, smothered, stifled, suppressed, top secret, ulterior, unbreatheable, under an eclipse, under cover, under house arrest, under security, underground, undisclosable, undisclosed, undivulgable, undivulged, unknown, unrevealable, unrevealed, unspoken, untellable, untold, unutterable, unuttered, unwhisperable, wrapped in clouds