The Collaborative International Dictionary of English v.0.48:

Skilled \Skilled\, a.
   Having familiar knowledge united with readiness and dexterity
   in its application; familiarly acquainted with; expert;
   skillful; -- often followed by in; as, a person skilled in
   drawing or geometry.
   [1913 Webster]

WordNet (r) 3.0 (2006):

skilled
    adj 1: having or showing or requiring special skill; "only the
           most skilled gymnasts make an Olympic team"; "a skilled
           surgeon has many years of training and experience"; "a
           skilled reconstruction of her damaged elbow"; "a skilled
           trade" [ant: unskilled]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "skilled":
   accomplished, adept, adept in, at concert pitch, at home in,
   career, coached, conversant, crack, crackerjack, expert, expert at,
   finished, good at, handy at, initiate, initiated, master,
   master of, masterful, masterly, old, old-time, practical,
   practiced, prepared, primed, professional, proficient in, seasoned,
   skilled in, skillful, strong in, technical, trained, up on, versed,
   versed in, vet, veteran, well up on, well-versed