Caliginous and Dun

Caliginous adjective - Being without light or without much light.

Dun and caliginous are semantically related In some cases you can use "Dun" instead an adjective "Caliginous".

Dun adjective - Of a dull greyish brown to brownish grey color.

Caliginous and dun are semantically related in gloomy topic. Sometimes you can use "Caliginous" instead an adjective "Dun", if it concerns topics such as lack of light.