adeptness

from WordNet (r) 3.0 (2006)

adeptness
    n 1: skillful performance or ability without difficulty; "his
         quick adeptness was a product of good design"; "he was
         famous for his facility as an archer" [syn: {adeptness},
         {adroitness}, {deftness}, {facility}, {quickness}]

from The Collaborative International Dictionary of English v.0.48

Adeptness \A*dept"ness\, n.
   The quality of being adept; skill.
   [1913 Webster]