WordWeb Online

1. A quick and penetrating intelligence
   "I admired the keenness of his mind";
   - acuteness, acuity, sharpness
    
2. A positive feeling of wanting to push ahead with something
   - eagerness, avidity, avidness
    
3. Thinness of edge or fineness of point
   - sharpness

See also: sharp

Type of: configuration, conformation, contour, enthusiasm, form, intelligence, shape

Antonym: bluntness