资料来源 : Webster's Revised Unabridged Dictionary (1913)

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

资料来源 : WordNet®

adeptness
     n : 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: {adroitness},
          {deftness}, {facility}, {quickness}]