lacking

1. ADJ If something or someone is lacking in a particular quality, they do not have any of it or enough of it. 缺乏的; 没有的[v-link ADJ]

...if your hair is lacking in lustre and feeling dry. …如果你的头发缺乏光泽并且感觉干燥。

She felt nervous, increasingly lacking in confidence about herself. 她感到紧张，对自己越来越缺乏信心。