The Collaborative International Dictionary of English v.0.48:

Courtly \Court"ly\ (-l?), a. [From Court.]
   1. Relating or belonging to a court.
      [1913 Webster]

   2. Elegant; polite; courtlike; flattering.
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            In courtly company or at my beads.    --Shak.
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   3. Disposed to favor the great; favoring the policy or party
      of the court; obsequious. --Macaulay.
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The Collaborative International Dictionary of English v.0.48:

Courtly \Court"ly\, adv.
   In the manner of courts; politely; gracefully; elegantly.
   [1913 Webster]

         They can produce nothing so courtly writ. --Dryden
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WordNet (r) 3.0 (2006):

courtly
    adj 1: refined or imposing in manner or appearance; befitting a
           royal court; "a courtly gentleman" [syn: courtly,
           formal, stately]

Moby Thesaurus II by Grady Ward, 1.0:

73 Moby Thesaurus words for "courtly":
   adulatory, aristocratic, august, bland, blandishing, blarneying,
   buttery, cajoling, ceremonious, chivalric, chivalrous, civilized,
   complimentary, conventional, courtierly, dignified, fair-spoken,
   fawning, fine-spoken, flattering, formal, fulsome, gallant,
   gracious, grand, grave, gushing, honey-mouthed, honey-tongued,
   honeyed, imposing, insincere, insinuating, kingly, knightly, lofty,
   lordly, magisterial, majestic, mealymouthed, noble, obsequious,
   oily, oily-tongued, old-fashioned, old-world, prim, princely,
   queenly, regal, royal, sedate, slimy, slobbery, smarmy, smooth,
   smooth-spoken, smooth-tongued, soapy, sober, soft-soaping, solemn,
   starchy, stately, statuesque, stiff, stilted, studied, sycophantic,
   unctuous, venerable, wheedling, worthy