unawares (
http://definr.com/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]