noun (n)

• the occurrence of a change for the worse(noun.event)

  Synonym:
  damage, harm
  

  source: wordnet30
• a symptom of reduced quality or strength(noun.state)

  Synonym:
  deterioration
  

  source: wordnet30
• the condition of being unable to perform as a consequence of physical or mental unfitness(noun.state)

  Example:
  Hearing impairment.
  

  Synonym:
  disability, disablement, handicap
  

  source: wordnet30
• damage that results in a reduction of strength or quality(noun.act)

  source: wordnet30
• the act of making something futile and useless (as by routine)(noun.act)

  Synonym:
  constipation, deadening, stultification
  

  source: wordnet30
• The state of being impaired; injury.(noun)

  source: webster1913