| Fog |
| Gloom |
| Dimness |
| Darkness |
| Obscurity |
| Fogginess |
| Haze or gloom |
| Darkness; gloom |
| Gloomy darkness |
| Thick, heavy air |
| Thick, gloomy air |
| Darkness or gloom |
| Gloomy atmosphere |
| Visibility reducer |
| Vision-blocking mist |
| Obfuscation, so to speak |
| It's difficult to see through |