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]