noun (n)

• a lack of competence(noun.state)

  Synonym:
  inadequacy
  

  source: wordnet30
• (pathology) inability of a bodily part or organ to function normally(noun.state)

  source: wordnet30
• lack of an adequate quantity or number(noun.attribute)

  Synonym:
  deficiency, inadequacy
  Antonym:
  adequacy, sufficiency
  

  source: wordnet30
• The quality or state of being insufficient; want of sufficiency; deficiency; inadequateness; as, the insufficiency of provisions, of an excuse, etc.(noun)

  source: webster1913