"unawares" in the adverb sense
1. unawares
without forethought or plan inadvertently
"came upon the diamond unawares"
2. unawares
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. short, unawares
at a disadvantage
"I was caught short"
Source: WordNet® (An amazing lexical database of English)
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