Source : Webster's Revised Unabridged Dictionary (1913)

Unsight \Un*sight"\, a.
   Doing or done without sight; not seeing or examining.
   [Colloq.]

   {Unsight unseen}, a colloquial phrase, denoting unseeing
      unseen, or unseen repeated; as, to buy a thing unsight
      unseen, that is, without seeing it.

            For to subscribe, unsight, unseen, To a new church
            discipline.                           --Hudibras.

            There was a great confluence of chapmen, that
            resorted from every part, with a design to purchase,
            which they were to do ``unsight unseen.''
                                                  --Spectator.