The Collaborative International Dictionary of English v.0.48:

Unhoused \Un*housed"\, a.
   1. [Properly p. p. of unhouse.] Driven from a house; deprived
      of shelter.
      [1913 Webster]

   2. [Pref. un- + housed.] Not provided with a house or
      shelter; houseless; homeless.
      [1913 Webster]