The Collaborative International Dictionary of English v.0.48:

Wareless \Ware"less\, a. [See Ware, n.]
   Unwary; incautious; unheeding; careless; unaware. [Obs.]
   [1913 Webster]

         And wareless of the evil
         That by themselves unto themselves is wrought.
                                                  --Spenser.
   [1913 Webster]