[1] : The Collaborative International Dictionary of English v.0.48

skillful \skill"ful\, a. written also skilful.
   1. discerning; reasonable; judicious; cunning. obs. "of
      skillful judgment." --chaucer.
      1913 webster

   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.
      1913 webster

            and they shall call the husbandman to mourning, and
            such as are skillful of lamentations to wailing.
                                                  --amos v. 16.
      1913 webster

   syn: expert; skilled; dexterous; adept; masterly; adroit;
        clever; cunning.
        1913 webster -- skill"fully, adv. --
        skill"fulness, n.
        1913 webster
see also:
skill"fully skill"fulness 

[2] : WordNet (r) 2.0

skillful
     adj 1: having or showing knowledge and skill and aptitude; "adept
            in handicrafts"; "an adept juggler"; "an expert job";
            "a good mechanic"; "a practiced marksman"; "a
            proficient engineer"; "a lesser-known but no less
            skillful composer"; "the effect was achieved by
            skillful retouching" syn: adept, expert, good,
            practiced, proficient, skilful
     2: done with delicacy and skill; "a nice bit of craft"; "a job
        requiring nice measurements with a micrometer"; "a nice
        shot" syn: nice
see also:
adept expert good practiced proficient skilful 
nice 

[3] : Moby Thesaurus II by Grady Ward, 1.0

92 moby thesaurus words for "skillful":
   daedalian, adept, adroit, advantageous, apt, artistic, auspicious,
   authoritative, beneficial, benevolent, bon, bonny, bravura, braw,
   brilliant, bueno, capital, clean, clever, cogent, commendable,
   coordinated, crack, crackerjack, cunning, cute, daedal, deft,
   dexterous, dextrous, diplomatic, elegant, estimable, excellent,
   expedient, expert, fair, famous, fancy, favorable, fine, good,
   goodish, goodly, graceful, grand, handy, healthy, helpful,
   ingenious, kind, laudable, learned, magisterial, master, masterful,
   masterly, neat, nice, no mean, noble, pleasant, politic, pretty,
   professional, proficient, profitable, quick, quite some, ready,
   regal, resourceful, royal, skilled, slick, some, sound, splendid,
   statesmanlike, stylish, tactful, the compleat, the complete,
   useful, valid, very good, virtuoso, virtuous, well-done,
   well-versed, wicked, workmanlike

Skillful >> S Words
Skillful, definition of term: Skillful
skillful_pag1.html