He has no self-confidence.

他毫无自信。

《牛津词典》

Life needs self-confidence. Self-confidence, is expected to succeed, No self-confidence, and success.

人生需求自信。自信者，可望取得胜利；不自信者，与胜利无缘。

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

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)

Just how many schools will feel the self-confidence to go down this route, for no very obvious gain, remains to be seen.

BBC: NEWS | UK | Education | Analysis: school reforms