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》

"I've had experience enough," said Hurstwood blandly, but he felt a little diffident about referring to Fitzgerald and Moy.

“我有足够的经验，”赫斯渥淡淡地说道，但他没敢提及费莫酒店。

youdao

Japanese officials have been more diffident about the agreement and insist their country's sanctions remain in place.

ECONOMIST: Six-party talks are to resume. Two cheers