noun (n)

• lack of potential for development(noun.cognition)

  Synonym:
  incapableness
  Antonym:
  capability, capableness, potentiality
  

  source: wordnet30
• the quality of not being capable -- physically or intellectually or legally(noun.attribute)

  Antonym:
  capability, capableness
  

  source: wordnet30
• The quality of being incapable; incapacity.(noun)

  source: webster1913