somberness

from WordNet (r) 3.0 (2006)

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

from The Collaborative International Dictionary of English v.0.48

Somberness \Som"ber*ness\, Sombreness \Som"bre*ness\, n.
   The quality or state of being somber; gloominess.
   [1913 Webster]