Funereal and Lightless

Funereal adjective - Causing or marked by an atmosphere lacking in cheer.

Lightless and funereal are semantically related In some cases you can use "Lightless" instead an adjective "Funereal".

Lightless adjective - Being without light or without much light.

Funereal and lightless are semantically related in dark topic. Sometimes you can use "Funereal" instead an adjective "Lightless", if it concerns topics such as dark-hued.