ADJ ~ about/of sth~ (as to) whether, how, what, etc. not certain of sth; having doubts 无把握；不确知；犹豫 There were a lot of things I was unsure about. 有许多事情我没把握。 He was unsure of what to do next. 他对下一步该做什么犹豫不定。 I was unsure how to reply to this question. 我拿不准该如何回答这个问题。 They were unsure as to what the next move should be. 下一步该做什么他们心里没底。 ADJ ~ (of yourself) lacking confidence in yourself 缺乏自信 Like many women, deep down she was unsure of herself. 和许多女性一样，她心底里缺乏自信。