gloominess

noun

1.
an atmosphere of depression and melancholy
drearihead dreich gloomies gloom glumness
2.
a feeling of melancholy apprehension
lour gloom somberness sombreness
Derived from:
gloomy
3.
the quality of excessive mournfulness and uncheerfulness
lugubriousness sadness
Derived from:
gloomy
4.
The property of having a frowning or scowling appearance.