the fact that something is not available or that there is not enough of it

Her only problem is a lack of confidence. 她唯一的问题是缺乏自信。

Lack of sleep had made him irritable. 睡眠不足令他烦躁易怒。

If he fails it won't be for/through lack of effort (= he has certainly tried). 他若失败了，那肯定不是因为他努力不够。

We won't be going away this year - lack of funds, I'm afraid. 今年我们恐怕不会去度假了——因为没钱。

Synonyms: absence (NOT EXISTING)deficiencywant (LACK)

to not have or not have enough of something that is needed or wanted

He just lacks a little confidence. 他只是有点缺乏自信。

What we lack in this house is space to store things. 我们这所房子缺少的是储物空间。

We are lacking three members of staff due to illness. 我们有3人因病缺席。