The Collaborative International Dictionary of English v.0.48:

Sluttish \Slut"tish\, a.
   Like a slut; untidy; indecently negligent of cleanliness;
   disorderly; as, a sluttish woman.
   [1913 Webster]

         Why is thy lord so slutish, I thee pray. --Chaucer.
   [1913 Webster]

         An air of liberal, though sluttish, plenty, indicated
         the wealthy farmer.                      --Sir W.
                                                  Scott.
   [1913 Webster] -- Slut"tish*ly, adv. -- Slut"tish*ness,
   n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sluttish
    adj 1: characteristic of or befitting a slut or slattern; used
           especially of women [syn: blowsy, blowzy,
           slatternly, sluttish]
    2: casual and unrestrained in sexual behavior; "her easy
       virtue"; "he was told to avoid loose (or light) women";
       "wanton behavior" [syn: easy, light, loose,
       promiscuous, sluttish, wanton]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "sluttish":
   beat-up, bedraggled, blowzy, botched, bungling, careless, chintzy,
   clumsy, deficient, dilapidated, drabbletailed, draggled,
   draggletailed, frowzy, frumpish, frumpy, grubby, half-assed,
   haphazard, hit-and-miss, hit-or-miss, in rags, informal, loose,
   lumpen, messy, mussy, negligent, poky, promiscuous, ragged,
   raggedy, ruinous, scraggly, seedy, shabby, shoddy, slack,
   slatternly, slipshod, slipshoddy, sloppy, slovenly, sordid,
   squalid, tacky, tattered, unkempt, unneat, unsightly, untidy