缺乏信心的 meaning in English

insecure
unsure

Even those passengers who were most distrustful of themselves plucked up amazingly
甚至那些对自己最缺乏信心的乘客也鼓起了勇气，真令人惊异。
For the students who do not have the confidence in the ncea system i can sympathize with you
那些对国家资格考试制度( ncea )缺乏信心的学生们，我对此感同身受。
The term " capital outflow " is regrettably a rather sensitive one , in view of the danger of its being attributable to a possible lack of confidence in the currency
碍于资金外流有可能被视为是对港元缺乏信心的举措，因此这个话题颇为敏感。然而，从港元远期汇率溢价细小，可见并无迹象显示对港元汇率缺乏信心。
They felt less confident about talking with bullies without blaming them and talking with bullied children without attributing cause of the bullying to them . there was significant difference in teacher ' s confidence about coping with bullying
6 、总体而言，中小学教师对于处理学校欺负问题最有信心的方面是制止欺负者的欺负行为，最缺乏信心的方面是如何与欺负者和受欺负者交谈。