Longman Dictionary of Contemporary English homepage

unsure

 adjective
     
un‧sure
1 not certain about something or about what you have to do
unsure of/about
I was unsure of the reaction I would get.
If you are unsure about anything, just ask.
unsure whether/what etc
Peter was unsure what to do next.
2

unsure of yourself

not having enough confidence:
Chris seemed nervous and unsure of herself.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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