Synonyms and related words :
cheerless, decorous, demure, discontented, earnest, formal, frowning, grave, grim, grim-faced, grim-visaged, humorless, in bad humor, infestive, joyless, long-faced, mirthless, miserable, out of humor, out of sorts, pleasureless, sedate, serious, sober, sober-minded, sobersided, solemn, somber, sorry, sorryish, staid, stone-faced, straight-faced, thoughtful, uncheerful, uncheery, unhappy, unjoyful, unmirthful, weighty, wretched