Sad; gloomy (7)
I believe the answer is:
doleful
I believe this is a double definition.
'sad' is the first definition.
(I've seen this in another clue)
'gloomy' is the second definition.
(thesaurus)
(Other definitions for doleful that I've seen before include "not happy?" , "Causing grief; sorrowful" , "Showing great melancholy" , "Mournful" , "Cheerless" .)