"gloominess" in the noun sense
1. gloom, gloominess, glumness
an atmosphere of depression and melancholy
"gloom pervaded the office"
2. gloom, gloominess, somberness, sombreness
a feeling of melancholy apprehension
3. gloominess, lugubriousness, sadness
the quality of excessive mournfulness and uncheerfulness
Source: WordNet® (An amazing lexical database of English)
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