noun (n)

• a state of comatose torpor (as found in sleeping sickness)(noun.state)

  Synonym:
  lethargy, sluggishness
  

  source: wordnet30
• a feeling of lack of interest or energy(noun.feeling)

  Synonym:
  languor, listlessness
  

  source: wordnet30
• weakness characterized by a lack of vitality or energy(noun.attribute)

  Synonym:
  inanition, lethargy, slackness
  

  source: wordnet30
• A condition of the body, or mind, when its voluntary functions are performed with difficulty, and only by a strong exertion of the will; languor; debility; weariness.(noun)

  source: webster1913