The Collaborative International Dictionary of English v.0.48:

Wealthy \Wealth"y\, a. [Compar. Wealthier; superl.
   Wealthiest.]
   [1913 Webster]
   1. Having wealth; having large possessions, or larger than
      most men, as lands, goods, money, or securities; opulent;
      affluent; rich.
      [1913 Webster]

            A wealthy Hebrew of my tribe.         --Shak.
      [1913 Webster]

            Thou broughtest us out into a wealthy place. --Ps.
                                                  lxvi. 12.
      [1913 Webster]

   2. Hence, ample; full; satisfactory; abundant. [R.]
      [1913 Webster]

            The wealthy witness of my pen.        --B. Jonson.
      [1913 Webster]

WordNet (r) 3.0 (2006):

wealthy
    adj 1: having an abundant supply of money or possessions of
           value; "an affluent banker"; "a speculator flush with
           cash"; "not merely rich but loaded"; "moneyed
           aristocrats"; "wealthy corporations" [syn: affluent,
           flush, loaded, moneyed, wealthy]

Moby Thesaurus II by Grady Ward, 1.0:

91 Moby Thesaurus words for "wealthy":
   abounding, abounding in riches, abundant, affluent, all-sufficing,
   ample, aplenty, big-rich, bottomless, bounteous, bountiful,
   comfortable, comfortably situated, copious, diffuse,
   disgustingly rich, easy, effuse, epidemic, exhaustless,
   extravagant, exuberant, fat, fertile, flush, frightfully rich,
   full, galore, generous, in clover, in funds, in good case,
   in luxury, in plenty, in quantity, in the money, independent,
   independently rich, independently wealthy, inexhaustible, lavish,
   liberal, loaded, luxuriant, luxurious, made of money, many,
   maximal, moneyed, much, numerous, on Easy Street, on velvet, oofy,
   opulent, overflowing, plenitudinous, plenteous, plentiful, plenty,
   prevailing, prevalent, prodigal, productive, profuse, profusive,
   prosperous, provided for, rampant, replete, rich, rich as Croesus,
   rife, riotous, rolling in money, running over, successful,
   superabundant, teeming, wallowing in wealth, warm,
   well provided for, well-fixed, well-found, well-furnished,
   well-heeled, well-off, well-provided, well-stocked, well-to-do,
   wholesale