Unaware
/ˌʌnəˈwɛr/
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Definition
(adj) Not aware or informed; lacking knowledge; unmindful.
Sentence Examples
The main reason is that the subjects were totally unaware of the possibility of shortcuts.
There is one important fact of which you are unaware.
CEFR Practice Quiz
He was ____ that the rules had changed, so he was quite surprised when he was told that he could not enter today.