The Collaborative International Dictionary of English v.0.48:

Dilapidated \Di*lap"i*da`ted\, a.
   Decayed; fallen into partial ruin; injured by bad usage or
   neglect.
   [1913 Webster]

         A deserted and dilapidated buildings.    --Cooper.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dilapidate \Di*lap"i*date\, v. t. [imp. & p. p. Dilapidated;
   p. pr. & vb. n. Dilapidating.] [L. dilapidare to scatter
   like stones; di- = dis- + lapidare to throw stones, fr. lapis
   a stone. See Lapidary.]
   1. To bring into a condition of decay or partial ruin, by
      misuse or through neglect; to destroy the fairness and
      good condition of; -- said of a building.
      [1913 Webster]

            If the bishop, parson, or vicar, etc., dilapidates
            the buildings, or cuts down the timber of the
            patrimony.                            --Blackstone.
      [1913 Webster]

   2. To impair by waste and abuse; to squander.
      [1913 Webster]

            The patrimony of the bishopric of Oxon was much
            dilapidated.                          --Wood.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dilapidated
    adj 1: in deplorable condition; "a street of bedraggled
           tenements"; "a broken-down fence"; "a ramshackle old
           pier"; "a tumble-down shack" [syn: bedraggled, broken-
           down, derelict, dilapidated, ramshackle,
           tatterdemalion, tumble-down]

Moby Thesaurus II by Grady Ward, 1.0:

111 Moby Thesaurus words for "dilapidated":
   ablative, battered, beat-up, beaten up, bedraggled, biodegradable,
   blowzy, broken-down, careless, chintzy, corrosive, crumbling,
   damaged, decayed, decaying, decomposable, decomposing, decrepit,
   degradable, derelict, destroyed, dingy, disintegrable,
   disintegrated, disintegrating, disintegrative, disjunctive,
   disruptive, doddering, down-at-heel, drabbletailed, draggled,
   draggletailed, dusty, erosive, faded, frowzy, frumpish, frumpy,
   fusty, gone to seed, groggy, grubby, impaired, in rags, in ruins,
   informal, injured, loose, lumpen, marred, messy, mildewed,
   moldering, moldy, moss-grown, moth-eaten, mussy, musty, negligent,
   poky, raddled, ragged, raggedy, ramshackle, ravaged, resolvent,
   ricketish, rickety, rocky, ruined, ruinous, run-down, rusty,
   scraggly, seedy, separative, shabby, shaky, shoddy, slack,
   slatternly, slipshod, sloppy, slovenly, slummy, sluttish, solvent,
   sordid, spidery, spindly, squalid, stale, tacky, tattered,
   teetering, teetery, threadbare, time-scarred, timeworn, tottering,
   tottery, tumbledown, unkempt, unneat, unsightly, unsteady, untidy,
   wobbly, worn, wrecked