Adverbs

(r)unawareswithout forethought or plan; inadvertently“came upon the diamond unawares”
(r)unawaressuddenly 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)
(r)short, unawaresat a disadvantage“I was caught short”