un ‧ sure /ˌʌnˈʃɔː◂ $ -ˈʃʊr◂/ BrE AmE adjective
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.