Acheronian, Acherontic, Cimmerian, Stygian, abstruse, ambiguous, armored, beclouded, blind, buried, calico, cased, castellatus, ceiled, cirrose, cirrous, cloaked, close, cloud-flecked, cloudy, coated, concealed, coped, covered, covert, cowled, cumuliform, cumulous, curtained, dapple, dappled, dark, dark and gloomy, dirty, dubious, eclipsed, encapsulated, encapsuled, encased, enveloped, enwrapped, equivocal, filmed, floored, funereal, gloomful, glooming, gloomy, heavy, hid, hidden, hooded, housed, ill-lighted, ill-lit, in a cloud, in a fog, in eclipse, in purdah, in the wings, incommunicado, latent, lenticularis, loricate, loricated, lowering, mammatus, mantled, marbled, masked, motley, mottled, muffled, mysterious, nebulous, nimbose, nubilous, obfuscated, obscure, obscured, occult, occulted, open, overcast, overclouded, packaged, paved, pepper-and-salt, piebald, pied, pinto, problematic, recondite, roofed-in, screened, scummed, secluded, secluse, secret, sequestered, shady, sheathed, shelled, shielded, shrouded, skewbald, somber, sombrous, squally, stormy, stratiform, stratous, swathed, tented, thunderheaded, uncertain, unclear, under an eclipse, under cover, under house arrest, under wraps, underground, unknown, unsettled, veiled, walled-in, walled, wrapped, wrapped in clouds