The Collaborative International Dictionary of English v.0.48:

Ably \A"bly\, adv.
   In an able manner; with great ability; as, ably done,
   planned, said.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

-ably \-a*bly\
   A suffix composed of -able and the adverbial suffix -ly; as,
   favorably.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ably
    adv 1: with competence; in a competent capable manner; "they
           worked competently" [syn: competently, aptly, ably,
           capably] [ant: displaying incompetence,
           incompetently]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "ably":
   adeptly, adequately, adroitly, agilely, aptly, artfully,
   artistically, brilliantly, capably, cleverly, competently,
   cunningly, deftly, dexterously, dextrously, effectively,
   effectually, efficiently, excellently, expertly, featly, handily,
   ingeniously, masterfully, neatly, nimbly, proficiently,
   resourcefully, skillfully, spryly, superbly, well,
   with consummate skill, with finesse, with genius, with skill