Source : Webster's Revised Unabridged Dictionary (1913)

Expertly \Ex*pert"ly\, adv.
   In a skillful or dexterous manner; adroitly; with readiness
   and accuracy.

Source : WordNet®

expertly
     adv : in an expert manner; "he repaired the TV set expertly" [syn:
            {like an expert}, {with expertise}] [ant: {amateurishly}]