noun (n)

• an atmosphere of depression and melancholy(noun.state)

  Synonym:
  gloom, gloominess
  

  source: wordnet30
• a gloomy ill-tempered feeling(noun.feeling)

  Synonym:
  moroseness, sullenness
  

  source: wordnet30
• Moodiness; sullenness.(noun)

  source: webster1913