The Collaborative International Dictionary of English v.0.48:

Unware \Un*ware"\, a. [AS. unw[ae]r unwary. See Un- not, and
   Wary.]
   [1913 Webster]
   1. Unaware; not foreseeing; being off one's guard. [Obs.]
      --Chaucer. --Fairfax.
      [1913 Webster]

   2. Happening unexpectedly; unforeseen. [Obs.]
      [1913 Webster]

            The unware woe of harm that cometh behind.
                                                  --Chaucer.
      [1913 Webster] -- Un*ware"ly, adv. [Obs.] --
      Un*ware"ness, n. [Obs.]
      [1913 Webster]