He has no self-confidence.

他毫无自信。

《牛津词典》

Though he had patrician self-confidence, there was no snobbery in Roosevelt.

虽然罗斯福有着贵族般的自信不疑，然而他却没有丝毫的纨绔习气。

youdao

If there is no self-confidence, it is really bad! If you don't believe in yourself, or doubt yourself, it's no worse.

要是没有自信心，那实在糟糕！要是你不相信自己，或者怀疑自己，那是再糟也没有了。

youdao

And I was just so overcome by emotion because at that point of time, you know, after 17 films, you have no self confidence left.

CNN: Interview with Abhishek Bachchan

There is no shortage of self-confidence in this young man.

CNN: Commentary: Obama a one-term president?

Trained mothers displayed greater self-confidence than mothers who had received no MOCEP training and reported that patterns of interaction with their husbands had changed.

UNESCO: Family Literacy Programmes (FLPs)