unawares
adverb /ˌʌnəˈweəz/
  /ˌʌnəˈwerz/
- when not expected
- The camera had caught her unawares.
 - The announcement took me unawares.
 - She came upon him unawares when he was searching her room.
 
 - (formal) without noticing or realizing
- He slipped unawares into sleep.
 
 
Word Originmid 16th cent.: from unaware + -s.