lack的形容词

She felt nervous, increasingly lacking in confidence about herself.

她感到紧张，对自己越来越缺乏信心。

These tasks were repetitive, lengthy and lacking any intrinsic interest.

这些作业重复冗长，没有什么意义。

What was lacking was a way of giving such images permanent form.

真正缺少的'是将这些影像永久保存下来的方法。