Source : Webster's Revised Unabridged Dictionary (1913)

Glooming \Gloom"ing\, n. [Cf. {Gloaming}.]
   Twilight (of morning or evening); the gloaming.

         When the faint glooming in the sky First lightened into
         day.                                     --Trench.

         The balmy glooming, crescent-lit.        --Tennyson.

Gloom \Gloom\, v. i. [imp. & p. p. {Gloomed}; p. pr. & vb. n.
   {Glooming}.]
   1. To shine or appear obscurely or imperfectly; to glimmer.

   2. To become dark or dim; to be or appear dismal, gloomy, or
      sad; to come to the evening twilight.

            The black gibbet glooms beside the way. --Goldsmith.

            [This weary day] . . . at last I see it gloom.
                                                  --Spenser.

Source : WordNet®

glooming
     adj : depressingly dark; "the gloomy forest"; "the glooming
           interior of an old inn"; "`gloomful' is archaic" [syn:
           {gloomy}, {gloomful}]