unsure
🇺🇸
/ˌʌnˈʃʊr/
🇬🇧
/ˌʌnˈʃʊə(r)/
not certain about something; having doubts
I am unsure about the answer to that question.
我对那个问题的答案不太确定。
lacking confidence in yourself
She felt unsure when speaking in front of the class.
在全班同学面前讲话时,她感到缺乏自信。