keenness

Noun

• thinness of edge or fineness of point

• a positive feeling of wanting to push ahead with something

• a quick and penetrating intelligence
  • he argued with great acuteness
    
  • I admired the keenness of his mind
    

Related words

• Synonyms: 
  sharpness , eagerness , avidity , avidness , acuteness , acuity
• Antonyms: 
  dullness , bluntness