The Collaborative International Dictionary of English v.0.48:

Splendrous \Splen"drous\, Splendorous \Splen"dor*ous\, a.
   Splendid. --Drayton.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "splendorous":
   beaming, bedazzling, blinding, blooming, bright,
   bright and shining, brilliant, charismatic, dazzling, devastating,
   divine, effulgent, flamboyant, flaming, fulgent, fulgid, garish,
   glamorous, glaring, glary, glorious, glowing, gorgeous, heavenly,
   illustrious, killing, lustrous, magic, magnificent, numinous,
   proud, radiant, raving, ravishing, refulgent, resplendent, shining,
   sparkling, splendent, splendid, splendiferous, splendrous,
   stunning, sublime, superb, vivid