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He was modest and diffident about his own success.
他很谦虚，不愿谈及自己的成功。
《牛津词典》
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His fault is that he's too diffident.
他的过失是太缺乏自信啦。
youdao
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He was too diffident to express his opinion.
他太不自信，不敢发表自己的见解。
youdao
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He was too diffident to express his opinion.
他太不自信，不敢发表自己的见解。
youdao