Source : Webster's Revised Unabridged Dictionary (1913)

Unpaved \Un*paved"\, a.
   1. Not paved; not furnished with a pavement. --Hakewill.

   2. Castrated. [Obs.] ``Unpaved eunuch.'' --Shak.

Source : WordNet®

unpaved
     adj : not having a hard surface [ant: {paved}]