The Collaborative International Dictionary of English v.0.48:

Resplendent \Re*splen"dent\ (-dent), a. [L. resplendens, -entis,
   p. pr. of resplendere to shine brightly; pref. re- re- +
   splendere to shine. See Splendid.]
   Shining with brilliant luster; very bright. --
   Re*splen"dent*ly, adv.
   [1913 Webster]

         With royal arras and resplendent gold.   --Spenser.
   [1913 Webster]

WordNet (r) 3.0 (2006):

resplendently
    adv 1: in an impressively beautiful manner; "the Princess was
           gorgeously dressed" [syn: gorgeously, splendidly,
           resplendently, magnificently]