English to English

noun (n)

• a symptom of reduced quality or strength(noun.state)

  Synonym:
  impairment
  

  source: wordnet30
• process of changing to an inferior state(noun.process)

  Synonym:
  declension, decline in quality, worsening
  

  source: wordnet30
• The process of growing worse, or the state of having grown worse.(noun)

  source: webster1913