1ADJ-GRADED [verb-link ADJ]缺少的;不足的;没有的 If something or someone is lacking in a particular quality, they do not have any of it or enough of it. 缺少的;不足的;没有的
...if your hair is lacking in lustre and feeling dry.
如果头发缺少光泽且干枯
She felt nervous, increasingly lacking in confidence about herself. [+ in]