skillfulness
  熟練
  Skill·ful a.
  1. Discerning; reasonable; judicious; cunning. [Obs.] “Of skillful judgment.”
  2. Possessed of, or displaying, skill; knowing and ready; expert; well-versed; able in management; as, a skillful mechanic; -- often followed by at, in, or of; as, skillful at the organ; skillful in drawing.
     And they shall call the husbandman to mourning, and such as are skillful of lamentations to wailing.   --Amos v. 16.
  Syn: -- Expert; skilled; dexterous; adept; masterly; adroit; clever; cunning.
  -- Skill*ful*ly, adv. -- Skill*ful*ness, n.
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  skillfulness
       n : the state of being cognitively skillful [ant: unskillfulness]