abstruse, beclouded, blind, close, clouded, concealed, covered, covert, deep-buried, drowned, eclipsed, engulfed, flooded, guarded, hid, hidden, immersed, in a cloud, in a fog, in eclipse, in purdah, in the wings, incommunicado, inundated, latent, mysterious, obfuscated, obscure, obscured, occult, privy, recondite, secluded, secluse, secret, sequestered, shrouded, subaqueous, submarine, submerged, submersed, subterranean, subterraneous, sunken, under an eclipse, under cover, under house arrest, under wraps, underground, undersea, underwater, unknown, wrapped in clouds