English to English

noun (n)

• a quick and penetrating intelligence(noun.cognition)

  Example:
  I admired the keenness of his mind.
  

  Synonym:
  acuity, acuteness, sharpness
  

  source: wordnet30
• a positive feeling of wanting to push ahead with something(noun.feeling)

  Synonym:
  avidity, avidness, eagerness
  

  source: wordnet30
• thinness of edge or fineness of point(noun.attribute)

  Synonym:
  sharpness
  Antonym:
  bluntness, dullness
  

  source: wordnet30
• The quality or state of being keen.(noun)

  source: webster1913