gloominess in WordNet English dictionary

1. a feeling of melancholy apprehension
   gloom  gloominess  somberness  sombreness 
   
2. an atmosphere of depression and melancholy
   "gloom pervaded the office"
   gloom  gloominess  glumness 
   
3. the quality of excessive mournfulness and uncheerfulness
   gloominess  lugubriousness  sadness