Source : Webster's Revised Unabridged Dictionary (1913)

Sumptuous \Sump"tu*ous\, a. [L. sumptuosus, fr. sumptus expanse,
   cost: cf. F. somptueux. See {Sumptuary}.]
   Involving large outlay or expense; costly; expensive; hence,
   luxurious; splendid; magnificient; as, a sumptuous house or
   table; sumptuous apparel.

         We are too magnificient and sumptuous in our tables and
         attendance.                              --Atterbury.

         She spoke, and turned her sumptuous head, with eyes Of
         shining expectation fixed on mine.       --Tennyson.
   -- {Sump"tu*ous*ly}, adv. -- {Sump"tu*ous*ness}, n.

Source : WordNet®

sumptuousness
     n 1: wealth as evidenced by sumptuous living [syn: {luxury}, {luxuriousness},
           {opulence}]
     2: the quality possessed by something that is excessively
        expensive [syn: {lavishness}, {luxury}, {sumptuosity}]