Longman Dictionary of Contemporary English homepage

unclear

 adjective
     
un‧clear
1 difficult to understand or be sure about, so that there is doubt or confusion:
The terms of the contract are very unclear.
2

be unclear about something

to not understand something clearly:
I'm rather unclear about what I'm supposed to be doing here.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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