Grieving (8)
(Other definitions for mournful that I've seen before include "Plangent" , "Doleful, plaintive" , "Feeling grief" , "Expressing sadness" , "Gloomy" .)
(Other definitions for mourning that I've seen before include "Grieving" , "Sorrowing" , "Feeling loss" , "wearing black" , "Black clothing" .)