Source : Webster's Revised Unabridged Dictionary (1913)

Unawares \Un`a*wares"\, adv.
   Without design or preparation; suddenly; without
   premeditation, unexpectedly. ``Mercies lighting unawares.''
   --J. H. Newman.

         Lest unawares we lose This our high place, our
         sanctuary, our hill.                     --Milton.

   {At unaware}, or {At unawares}, unexpectedly; by surprise.

            He breaks at unawares upon our walks. --Dryden.

            So we met In this old sleepy town an at unaware.
                                                  --R. Browning.

Source : WordNet®

unawares
     adv 1: without forethought or plan; inadvertently; "came upon the
            diamond unawares"
     2: suddenly and unexpectedly; "rain caught them unawares";
        "sorrow comes to all, and to the young it comes with
        bittered agony because it takes them unawares"- A.Lincoln
     3: at a disadvantage; "I was caught short" [syn: {short}]