The Collaborative International Dictionary of English v.0.48:

Untidy \Untidy\
   See tidy.

The Collaborative International Dictionary of English v.0.48:

Untidy \Un*ti"dy\, a.
   1. Unseasonable; untimely. [Obs.] "Untidy tales." --Piers
      Plowman.
      [1913 Webster]

   2. Not tidy or neat; slovenly.
      [1913 Webster] -- Un*ti"di*ly, adv. -- Un*ti"di*ness,
      n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

untidy
    adj 1: not neat and tidy; "careless and untidy in her personal
           habits"; "an untidy living room"; "untidy and casual
           about money" [ant: tidy]

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "untidy":
   beat-up, bedraggled, blowzy, botched, bungling, careless, chaotic,
   chintzy, clumsy, cluttered, deficient, dilapidated, dingy, dirty,
   disheveled, disorderly, drabbletailed, draggled, draggletailed,
   dusty, frowzy, frumpish, frumpy, grimy, grubby, grungy, half-assed,
   haphazard, helter-skelter, hit-and-miss, hit-or-miss, in rags,
   informal, jumbled, littered, loose, lumpen, messy, miry, muddy,
   mussy, negligent, poky, promiscuous, ragged, raggedy, ruinous,
   rumpled, scraggly, scruffy, seedy, shabby, shoddy, slack, slapdash,
   slatternly, slipshod, slipshoddy, sloppy, slovenly, sluttish,
   smirchy, smoky, smudgy, smutchy, smutty, snuffy, sooty, sordid,
   squalid, tacky, tattered, uncombed, unfastidious, unkempt, unneat,
   unsightly, unthorough