| layer(noun, verb, cover, obscure, hide) |
| mask(verb, cover, obscure, confuse, hide) |
| mottle |
| muddiness |
| murkiness |
| nubilous(dark, gloomy, gray, misty, unlit) |
| obfuscous(adjective, dull, obscure, dark, gloomy) |
| obnubilate |
| obscuration(obscurity, fogginess, mistiness) |
| pitch-black(adjective, dull, dark, gloomy, dim) |
| pitch-dark(adjective, dull, dark, gloomy, dim) |
| pitchy(adjective, dull, dark, gloomy, dim) |
| rayless(adjective, dull, dark, gloomy, dim) |
| screen(verb, cover, obscure, confuse, hide) |
| sepulchral(adjective, sorrow, depress, sadness, emotion) |
| set on(verb, expression, phrasal verb, cover, obscure) |
| shield(verb, cover, obscure, hide, protect) |
| shroud(verb, cover, obscure, confuse, hide) |
| smog(gloom, obscurity, darkness, puff, mist) |
| smoggy(adjective, turbid) |