| lack-lustre |
| leaden(adjective, dull, soft, obscure, flat) |
| light(adjective, dull, quiet, weak, soft) |
| lusterless(adjective, dull, light, flat, boring) |
| melancholy(adjective, blue, sad, depression, woe) |
| obscured(adjective, dark, gloomy, vague, indefinite) |
| pallid(adjective, dull, quiet, light, soft) |
| pedestrian(adjective, dull, heavy, ordinary, boring) |
| pitch-black(adjective, dull, dark, gloomy, black) |
| pitch-dark(adjective, dull, obscure, dark, gloomy) |
| sallow(adjective, dull, light, soft, poor) |
| shroud(cover, obscure, hide, conceal, veil) |
| soften(verb, dull, quiet, moderate, diminish) |
| turbid(adjective, dark, gloomy, dense, cloudy) |
| unlighted(adjective, dull, dark, gloomy, black) |
| washed out(verb, expression, phrasal verb, dull, dissolve) |
| weak-minded(adjective, slow, stupid, intelligent) |
| white(adjective, dull, light, soft, poor) |
| whiten(verb, reduce, diminish) |
| wispy |