unawares in WordNet English dictionary

1. at a disadvantage
   "I was caught short"
   short  unawares  short  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
   unawares  unawares 
   
3. without forethought or plan; inadvertently
   "came upon the diamond unawares"
   unawares  unawares