| flustered(verb, confused) |
| frosted(pale, white, frosty, cloudy, opaque) |
| grimy(adjective, dull, dark, gloomy, dim) |
| iffy(adjective, clear, informal, certain, uncertain) |
| impenetrable |
| in a cloud(expression, idiom, concealment) |
| in a fog(expression, idiom, concealment) |
| indefinite(adjective, dull, obscure, uncertain, dim) |
| indiscernible(adjective, obscure, dark, secret, unknown) |
| invisible(obscure, dark, secret, unknown, hidden) |
| latent(obscure, dark, secret, unknown, hidden) |
| leaden(adjective, dull, lead, gloomy, grim) |
| lightless(adjective, dull, dark, gloomy, dim) |
| livid(adjective, dull, obscure, lead, dark) |
| lurid(adjective, dull, dark, gloomy, dim) |
| menacing |
| muzzy |
| mysterious(adjective, obscure, dark, secret, private) |
| nubilous |
| occult(obscure, dark, secret, unknown, hidden) |