The Collaborative International Dictionary of English v.0.48:

Inundate \In*un"date\, v. t. [imp. & p. p. Inundated; p. pr. &
   vb. n. Inundating.] [L. inundatus, p. p. of inundare to
   inundate; pref. in- in + undare to rise in waves, to
   overflow, fr. unda a wave. See Undulate.]
   [1913 Webster]
   1. To cover with a flood; to overflow; to deluge; to flood;
      as, the river inundated the town.
      [1913 Webster]

   2. To fill with an overflowing abundance or superfluity; as,
      the country was inundated with bills of credit.

   Syn: To overflow; deluge; flood; overwhelm; submerge; drown.
        [1913 Webster]

WordNet (r) 3.0 (2006):

inundated
    adj 1: covered with water; "the main deck was afloat (or
           awash)"; "the monsoon left the whole place awash"; "a
           flooded bathroom"; "inundated farmlands"; "an overflowing
           tub" [syn: afloat(p), awash(p), flooded,
           inundated, overflowing]

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "inundated":
   afloat, at flood, awash, bathed, broken-down, brokenhearted,
   buried, crushed, cut up, deluged, desolated, dipped, drenched,
   dribbling, dripping, dripping wet, drowned, engulfed, flooded,
   heart-stricken, heart-struck, heartbroken, immersed, in spate,
   inflood, macerated, oozing, overcome, overflowed, overwhelmed,
   permeated, saturated, seeping, soaked, soaking, soaking wet, soaky,
   sodden, soggy, sopping, sopping wet, soppy, soused, steeped,
   stricken, subaqueous, submarine, submerged, submersed, sunken,
   swamped, swept, undersea, underwater, undone, washed, water-washed,
   waterlogged, watersoaked, weeping, weltering, whelmed,
   wringing wet