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; 沒有的[v-link ADJ]

...if your hair is lacking in lustre and feeling dry. …如果你的頭發缺乏光澤竝且感覺乾燥。

She felt nervous, increasingly lacking in confidence about herself. 她感到緊張，對自己越來越缺乏信心。