somberness
     n 1: a state of partial or total darkness; "he struck a match to
          dispell the gloom" [syn: {gloom}, {sombreness}]
     2: a feeling of melancholy apprehension [syn: {gloom}, {gloominess}]
     3: a manner that is serious and solemn [syn: {graveness}, {gravity},
         {sobriety}, {soberness}]
Source: WordNet® 2.0