The Collaborative International Dictionary of English v.0.48:

overabundant \overabundant\ adj.
   present in excess.

   Syn: plethoric, rife.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

overabundant
    adj 1: excessively abundant [syn: overabundant, plethoric,
           rife]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "overabundant":
   lavish, overbounteous, overcopious, overexuberant, overflowing,
   overgenerous, overlavish, overliberal, overluxuriant, overmuch,
   overnumerous, overplenteous, overplentiful, overplenty,
   overpopulated, overpopulous, overprolific, plentiful, plethoric,
   prodigal, pullulating, riotous, superabundant, swarming, teeming