1. 
[syn: common, plebeian, vulgar, unwashed]
2.  not cleaned with or as if with soap and water; 
- Example: "a sink full of unwashed dishes"
The Collaborative International Dictionary of English v.0.48:
Unwashed \Un*washed"\, a.
   Not washed or cleansed; filthy; unclean.
   [1913 Webster]
   [1913 Webster]
WordNet (r) 3.0 (2006):
unwashed
    adj 1: of or associated with the great masses of people; "the
           common people in those days suffered greatly"; "behavior
           that branded him as common"; "his square plebeian nose";
           "a vulgar and objectionable person"; "the unwashed
           masses" [syn: common, plebeian, vulgar, unwashed]
    2: not cleaned with or as if with soap and water; "a sink full
       of unwashed dishes"
Moby Thesaurus II by Grady Ward, 1.0:
40 Moby Thesaurus words for "unwashed":
   base, baseborn, canaille, contaminated, corrupted, dirty, dregs,
   humble, impure, infected, low, lowborn, lowly, masses, mean, mob,
   nonkosher, plebeian, polluted, proletariat, ragtag and bobtail,
   riffraff, ritually unclean, scum, the great unwashed, the masses,
   the mob, the populace, the population, trash, tref, unbathed,
   unclean, uncleaned, uncleanly, unpure, unscoured, unscrubbed,
   unswept, unwiped