I read a book and came across "caught you unawares". I kept thinking it's supposed to be "caught you unaware".
Is this an acceptable form or was that a typo or something?
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This is a correct form.
Unawares is an adverb meaning "while not aware of something" or "by surprise".
Caught needs an adverb complement, so
unawares fits nicely. It turns out
unawares was actually Random House's word of the day several years back, and this does a nice job of explaining it.