The Collaborative International Dictionary of English v.0.48:

Slovenly \Slov"en*ly\, a.
   1. Having the habits of a sloven; negligent of neatness and
      order, especially in dress.
      [1913 Webster]

            A slovenly, lazy fellow, lolling at his ease.
                                                  --L'Estrange.
      [1913 Webster]

   2. Characteristic of a sloven; lacking neatness and order;
      evincing negligence; as, slovenly dress.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slovenly \Slov"en*ly\, adv.
   a slovenly manner.
   [1913 Webster]

WordNet (r) 3.0 (2006):

slovenly
    adj 1: negligent of neatness especially in dress and person;
           habitually dirty and unkempt; "filled the door with her
           frowzy bulk"; "frowzy white hair"; "slovenly appearance"
           [syn: frowsy, frowzy, slovenly]

Moby Thesaurus II by Grady Ward, 1.0:

88 Moby Thesaurus words for "slovenly":
   barbarous, beat-up, bedraggled, blowsy, blowzy, botched, bungling,
   careless, chintzy, clumsy, deficient, dilapidated, dingy, dirty,
   disheveled, dowdy, down-at-heel, drabbletailed, draggled,
   draggletailed, dusty, erroneous, faulty, frowsy, frowzy, frumpish,
   frumpy, grimy, grubby, grungy, half-assed, haphazard, hit-and-miss,
   hit-or-miss, imprecise, improper, in rags, incorrect, infelicitous,
   informal, loose, lumpen, messy, miry, muddy, mussy, negligent,
   poky, promiscuous, ragged, raggedy, raunchy, ruinous, scraggly,
   scruffy, seedy, shabby, shoddy, slack, slapdash, slatternly,
   sleazy, slipshod, slipshoddy, slobbery, sloppy, sloven, sluttish,
   smirchy, smoky, smudgy, smutchy, smutty, snuffy, solecistic, sooty,
   sordid, squalid, tacky, tattered, uncombed, unfastidious,
   ungrammatic, unkempt, unneat, unsightly, unthorough, untidy