What is another word for "obscurity"?

Roget's Thesaurus (1911) lists these synonyms for "obscurity": ambiguity, call, cloud, cloudiness, cloudy, crabbed, darkness, dim, dirty, film, fog, foggy, fuliginous, fumid, hard, haze, haziness, hazy, impervious, inexactness, instrument, involution, involved, light, meaning, measure, misty, muddiness, muddy, muggy, murky, neologism, nephelometer, nubiferous, obfuscate, obscure, obstruct, offuscate, opacity, opacous.