The Collaborative International Dictionary of English v.0.48:

Lavish \Lav"ish\ (l[a^]v"[i^]sh), a. [Akin to E. lave to lade
   out; cf. AS. gelafian to refresh, G. laben.]
   1. Expending or bestowing profusely; profuse; prodigal; as,
      lavish of money; lavish of praise.
      [1913 Webster]

   2. Superabundant; excessive; as, lavish spirits.
      [1913 Webster]

            Let her have needful, but not lavish, means. --Shak.

   Syn: Profuse; prodigal; wasteful; extravagant; exuberant;
        immoderate. See Profuse.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lavish \Lav"ish\, v. t. [imp. & p. p. Lavished (-[i^]sht); p.
   pr. & vb. n. Lavishing.]
   To expend or bestow with profusion; to use with prodigality;
   to squander; as, to lavish money or praise.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lavish
    adj 1: very generous; "distributed gifts with a lavish hand";
           "the critics were lavish in their praise"; "a munificent
           gift"; "his father gave him a half-dollar and his mother
           a quarter and he thought them munificent"; "prodigal
           praise"; "unsparing generosity"; "his unstinted
           devotion"; "called for unstinting aid to Britain" [syn:
           lavish, munificent, overgenerous, too-generous,
           unsparing, unstinted, unstinting]
    2: characterized by extravagance and profusion; "a lavish
       buffet"; "a lucullan feast" [syn: lavish, lucullan,
       lush, plush, plushy]
    v 1: expend profusely; also used with abstract nouns; "He was
         showered with praise" [syn: lavish, shower]

Moby Thesaurus II by Grady Ward, 1.0:

209 Moby Thesaurus words for "lavish":
   abounding, abundant, accord, administer, affluent, afford,
   alive with, all-sufficing, allot, allow, ample, aplenty, award,
   bestow, bestow on, bighearted, blow, bottomless, bounteous,
   bountiful, bristling, bursting, communicate, confer, copious,
   crawling, crowded, crowding, deal, deal out, diffuse, dish out,
   dispense, dissipate, dissipative, dole, dole out, donate,
   easy come, easy go, effuse, effusive, epidemic, exaggerated,
   excessive, exhaustless, expend, extend, extravagant, exuberant,
   fat, fertile, flush, fork out, free, freehanded, freehearted, full,
   galore, gamble away, generous, gift, gift with, give, give freely,
   give out, giving, go through, gorgeous, gracious, grant,
   greathearted, hand out, handsome, hang the expense, heap, help to,
   hospitable, immoderate, impart, impressive, improvident, in plenty,
   in profusion, in quantity, incontinent, inexhaustible, intemperate,
   issue, jam-packed, jammed, large, largehearted, let have, liberal,
   lush, luxuriant, luxurious, magnanimous, many, maximal, mete,
   mete out, much, munificent, numerous, offer, open, open-handed,
   openhanded, openhearted, opulent, overabundant, overbounteous,
   overcopious, overexuberant, overflowing, overgenerous, overlavish,
   overliberal, overluxuriant, overmuch, overnumerous, overplenteous,
   overplentiful, overplenty, overpopulated, overpopulous,
   overprolific, packed, penny-wise and pound-foolish, plenitudinous,
   plenteous, plentiful, plenty, plethoric, populous, pound-foolish,
   pour, present, prevailing, prevalent, princely, prodigal,
   productive, proffer, profligate, profuse, profusive, proliferating,
   prolific, pullulating, rain, rampant, render, replete, rich, rife,
   riotous, run through, running over, scatter, seize the day, serve,
   shell out, shower, sink, slather, slip, snow, sow broadcast, spend,
   spendthrift, splendid, squander, stintless, studded, sumptuous,
   superabundant, swarming, teeming, tender, thick, thick as hail,
   thick with, thick-coming, thronged, thronging, throw away,
   throw money around, thrust, uncurbed, ungrudging, unreasonable,
   unrestrained, unselfish, unsparing, unstinted, unstinting,
   vouchsafe, waste, wasteful, wealthy, well-found, well-furnished,
   well-provided, well-stocked, wholesale, yield