Source : Webster's Revised Unabridged Dictionary (1913)

Somber \Som"ber\, Sombre \Som"bre\(?; 277), a. [F. sombre; cf.
   Sp. sombra, shade, prob. from LL. subumbrare to put in the
   shade; L. sub under + umbra shade. See {Umbrage}.]
   1. Dull; dusky; somewhat dark; gloomy; as, a somber forest; a
      somber house.

   2. Melancholy; sad; grave; depressing; as, a somber person;
      somber reflections.

            The dinner was silent and somber; happily it was
            also short.                           --Beaconsfield.

Somber \Som"ber\, Sombre \Som"bre\, v. t.
   To make somber, or dark; to make shady. [R.]

Somber \Som"ber\, Sombre \Som"bre\, n.
   Gloom; obscurity; duskiness; somberness. [Obs.]

Source : WordNet®

sombre
     adj 1: grave or even gloomy in character; "solemn and mournful
            music"; "a suit of somber black"; "a somber mood"
            [syn: {somber}]
     2: lacking brightness or color; dull; "drab faded curtains";
        "sober Puritan gray"; "children in somber brown clothes"
        [syn: {drab}, {sober}, {somber}]