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。 ■(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。