lu ‧ gu ‧ bri ‧ ous /luːˈɡuːbriəs/ BrE AmE adjective literary
[ Date: 1600-1700 ; Language: Latin ; Origin: lugubris , from lugere 'to be sad, mourn' ]
very sad and serious – sometimes used humorously SYN melancholy , morose :
his lugubrious tear-stained face
—lugubriously adverb