Meaning of “unawares” - Learner’s Dictionary

unawares

adverb uk us /ˌʌnəˈweəz/
catch/take sb unawares

If something catches or takes you unawares, it happens when you do not expect it to:

The rain caught me unawares and I didn't have my umbrella.

(Definition of “unawares” from the Cambridge Learner’s Dictionary © Cambridge University Press)