a lacking self-confidence
a lacking or indicating lack of confidence or assurance
a. 不肯定的, 不确定的, 没有自信的
1. I am unsure about which restaurant to choose for dinner.
我不确定晚餐要选择哪个餐厅。
2. She felt unsure of herself during the presentation.
她在演讲时感到不自信。
3. If you are unsure, you can ask for help.
如果你不确定，可以寻求帮助。