WordNet sense 1 (not properly maintained):

unkempt

WordNet sense 2 (lacking neatness or order):

sloppy

WordNet sense 3 (dirty and disorderly):

messy, mussy

WordNet sense 4 (negligent of neatness especially in dress and person; habitually dirty and unkempt):

slovenly

WordNet sense 5 (in utter disorder):

disorderly

WordNet sense 6 (in disarray; extremely disorderly):

disheveled

WordNet sense 7 (characteristic of or befitting a slut or slattern; used especially of women):

slatternly