The Collaborative International Dictionary of English v.0.48:

Splendidly \Splen"did*ly\, adv.
   In a splendid manner; magnificently.
   [1913 Webster]

WordNet (r) 3.0 (2006):

splendidly
    adv 1: extremely well; "he did splendidly in the exam"; "we got
           along famously" [syn: excellently, magnificently,
           splendidly, famously]
    2: in an impressively beautiful manner; "the Princess was
       gorgeously dressed" [syn: gorgeously, splendidly,
       resplendently, magnificently]

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "splendidly":
   abundantly, acutely, amazingly, amply, aright, astonishingly,
   awesomely, brightly, brilliantly, capitally, conspicuously,
   copiously, dazzlingly, devastatingly, divinely, elaborately,
   elegantly, eminently, emphatically, excellently, exceptionally,
   exquisitely, extraordinarily, extravagantly, exuberantly, famously,
   fine, finely, generously, glaringly, gloriously, glowingly,
   gorgeously, grandiosely, grandly, imposingly, impressively,
   incredibly, intensely, luxuriously, magically, magnanimously,
   magnificently, majestically, markedly, marvelously, nicely, nobly,
   notably, particularly, peculiarly, pointedly, preeminently,
   profusely, prominently, pronouncedly, proudly, radiantly, ravingly,
   ravishingly, remarkably, richly, right, royally, signally,
   singularly, splendaciously, splendiferously, splendorously,
   splendrously, strikingly, stunningly, sublimely, sumptuously,
   superbly, superlatively, surpassingly, surprisingly, uncommonly,
   unusually, very well, well, wonderfully, wondrous, worthily