Source : Webster's Revised Unabridged Dictionary (1913)

Unwashed \Un*washed"\, a.
   Not washed or cleansed; filthy; unclean.

Source : WordNet®

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}]
     2: not cleaned with or as if with soap and water; "a sink full
        of unwashed dishes"