他惟一的弱点是他的脾气。

His only weakness is his temperament.

《柯林斯英汉双解大词典》

我已认识他多年，可还是摸不透他的脾气。

I've known him for years, but I still don't know what pushes his buttons.

《牛津词典》

他的脾气总是很好，见到你总是很高兴，你走了他总是很难过！

He is always good-tempered, always glad to see you, always sorry when you go!

youdao

Like, he really is that person, very sort of hot and fiery and says what he thinks.

例如，他确实是这样的人，非常性感，脾气火爆，想说什么就说什么。

认识戈登•拉姆齐吗？ - SpeakingMax英语口语达人