gloom gloom /ˈgluːm/

noun

1. () A state of partial or total darkness  ( somberness [American] , sombreness [Canadian, British] , gloom )
   a state of partial or total darkness
    He struck a match to dispel the gloom
   he struck a match to dispel the gloom
   
2. () A feeling of melancholy apprehension  ( gloominess , somberness [American] , sombreness [Canadian, British] , gloom )
   a feeling of melancholy apprehension
   
3. An atmosphere of depression and melancholy  ( gloom , gloominess , glumness )
   an atmosphere of depression and melancholy
    Gloom pervaded the office
   gloom pervaded the office