/,ʌn'ʃɔ:(r); [US] -'ʃʊər; ʌn`ʃur/
adj [pred 作表语]
1 ~ (of oneself) having little self-confidence 缺乏自信心
*He's rather unsure of himself. 他对自己没有什么信心.
2 ~ (about/of sth) not having certain knowledge (about sth) （对某事）不确知, 无把握
*I'm unsure of the facts. 我不能肯定事实是否如此.
* We were unsure (about) who was to blame. 我们说不清该责怪谁.

adj
not certain about something or about what you have to do
unsure of/about
　I was unsure of the reaction I would get.
　If you are unsure about anything, just ask.
unsure whether/what etc
　Peter was unsure what to do next.
unsure of yourself
not having enough confidence
　Chris seemed nervous and unsure of herself.