unsure
adjective uk/ʌnˈʃɔːr/ us/ʌnˈʃʊr/
B2 不确定的，不肯定的；有疑虑的
not certain or having doubts
I'm unsure about what to do next - can you help me? 我有点儿拿不准下一步该做什么——你能帮帮我吗？
unsure of yourselfC2 对自己没有信心
without confidence in yourself
As a new teacher I was very unsure of myself when I was in front of a class. 作为一名新教师站在全班面前时，我很不自信。