1. 
[syn: dark, dour, glowering, glum, moody, morose, saturnine, sour, sullen]
The Collaborative International Dictionary of English v.0.48:
Glower \Glow"er\, v. i. [imp. & p. p. Glowered; p. pr. & vb.
   n. Glowering.] [Cf. Gloar.]
   to look intently; to stare angrily or with a scowl.
   --Thackeray.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
glowering \glowering\ adj.
   having a cheerless aspect or disposition.
   Syn: dour, glum, moody, morose, saturnine, sour, sullen.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
glowering
    adj 1: showing a brooding ill humor; "a dark scowl"; "the
           proverbially dour New England Puritan"; "a glum, hopeless
           shrug"; "he sat in moody silence"; "a morose and
           unsociable manner"; "a saturnine, almost misanthropic
           young genius"- Bruce Bliven; "a sour temper"; "a sullen
           crowd" [syn: dark, dour, glowering, glum,
           moody, morose, saturnine, sour, sullen]
Moby Thesaurus II by Grady Ward, 1.0:
24 Moby Thesaurus words for "glowering":
   beetle-browed, black, black-browed, dark, dejected, dour, dumpish,
   frowning, glum, grim, grum, lowering, melancholy, moodish, moody,
   mopey, moping, mopish, morose, mumpish, scowling, sulky, sullen,
   surly