Synonyms and related words :
abstruse, armored, beamless, beclouded, bedazzled, between the lines, beyond one, black, black as night, blind, blindfold, blindfolded, buried, caliginous, cased, ceiled, cloaked, close, clouded, coated, complex, complicated, concealed, coped, covered, covert, cowled, crabbed, cramp, cryptic, curtained, dark, dark as night, dark as pitch, darkened, darkling, darksome, dazed, dazzled, delitescent, difficult, dormant, ebon, ebony, eclipsed, encapsulated, encapsuled, encased, enveloped, enwrapped, esoteric, excecate, filmed, floored, garbled, guarded, hard, hard to understand, hibernating, hid, hidden, hooded, hoodwinked, housed, in a cloud, in a fog, in eclipse, in purdah, in the wings, incommunicado, intricate, jumbled, knotty, latent, loricate, loricated, lurking, mantled, masked, muffled, mysterious, mystic, night-black, night-clad, night-cloaked, night-dark, night-enshrouded, night-filled, night-mantled, night-veiled, obfuscated, obscure, occult, occulted, overtechnical, packaged, paved, perplexed, pitch-black, pitch-dark, pitchy, possible, potential, privy, rayless, recondite, roofed-in, scrambled, screened, scummed, secluded, secluse, secret, sequestered, sheathed, shelled, shielded, shrouded, sleeping, snow-blind, snow-blinded, starless, submerged, sunless, swathed, tenebrious, tenebrose, tenebrous, tented, tough, under an eclipse, under cover, under house arrest, under the surface, under wraps, underground, underlying, unilluminated, unknown, unlighted, unlit, unmanifested, veiled, virtual, walled, walled-in, wrapped, wrapped in clouds