unsure
/ˌʌnˈʃɔː(r)/adjective
1- not feeling, showing, or done with confidence and certainty缺乏信心的; 无把握的; 不肯定的：
she was feeling nervous, unsure of herself.
她感到紧张, 对自己没有信心
with clause she was unsure how to reply.她不知道该如何回答。
1.1
- (of a fact) not fixed or certain（事实） 不固定的, 不确定的：
the date is unsure.
日期未定。
派生词