Meaning : A state of partial or total darkness.
Example :
He struck a match to dispel the gloom.
Synonyms : somberness, sombreness
Meaning : A feeling of melancholy apprehension.
Synonyms : gloominess, somberness, sombreness
Meaning : An atmosphere of depression and melancholy.
Example :
Gloom pervaded the office.
Synonyms : gloominess, glumness