unsure ['ʌn'ʃuə]

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附加级

adj.缺乏信心的；无把握的

There were a lot of things I was unsure about. 有许多事情我没把握。
They looked unsure and shifted uneasily from foot to foot. 他们看上去没有把握，站在那儿左右脚换来换去不安地晃着。