| grim(adjective, gloomy, depressing, feature, dull) |
| concealed(adjective, feature, secret, hidden, obscure) |
| dusk(noun, adjective, time, darkness, place) |
| mysterious(adjective, feature, obscure, hidden, secret) |
| twilight(noun, time, adjective, darkness, state) |
| depressing(adjective, feature, description, characteristics, attribute) |
| hidden(adjective, feature, obscure, mysterious, characteristic) |
| dull(adjective, unhappy, gloomy, dirty, miserable) |
| cryptic(adjective, obscure, secret, feature, hidden) |
| arcane(adjective, feature, characteristic, obscure, description) |
| recondite(adjective, obscure, mysterious, feature, hidden) |
| secret(adjective, feature, obscure, mysterious, hidden) |
| sunless(adjective, characteristic, shade, color, feature) |
| unlit(adjective, characteristic, shade, color, feature) |
| enigmatic(adjective, feature, mysterious, obscure, characteristic) |
| dour(adjective, feature, character, sadness, description) |
| drab(adjective, dull, bay, buff, feature) |
| swarthy(adjective, feature, appearance, pitch, inky) |
| threatening(adjective, feature, character, gloomy, description) |
| sullen(adjective, dull, gloomy, black, character) |