Adjective

1. Not having seen the object beforehand.
   • 1902, Myrtle Reed, Lavender and Old Lace, ch. 5,

     When she wrote, asking me to take charge of her house while she went to Europe, I gladly consented, sight unseen.

   • 2005, Michiko Kakutani, "They'll Take Manhattan, for a Million or More," New York Times, 2 Aug. (retrieved 1 Sep. 2008),

     More than $300 million worth of condominiums were sold in the new Time Warner complex sight unseen while the building was still under construction.