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1·John was as bouncy and ebullient as Helen was diffident and reserved.

约翰活泼、热情；而海伦却羞怯、矜持。《柯林斯英汉双解大词典》

2·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》

3·Speak out, my boy--don't be diffident.

说出来吧，孩子——别害怕。

4·His fault is that he's too diffident.

他的过失是太缺乏自信啦。

5·He was too diffident to express his opinion.

他太不自信，不敢发表自己的见解。

6·The quality or state of being diffident; timidity or shyness.

胆怯缺乏自信的性质或状态；

7·I'd be less diffident if the men wouldn't differentiate between us all the time.

如果男人们一向区分不出我们两，我就不会那么缺乏自信了。

8·Aristocratic languor, critics thought, made him too diffident sometimes on the field.

高贵的慵懒，批评家的思想，使他有时候在球场上与众不同。

9·The simulation test can study the movement law of pollutant diffusion under the diffident hydrodynamic condition.

模拟试验能够更好地研究不同水动力条件下污染物的扩散运移规律。

10·The diffident institutional environments in different countries lead to different management methods of urban design.

重点阐述了“制度环境”差别对不同国家采用不同城市设计管理模式的影响和制约作用。

不自信

1·He was too diffident to express his opinion.

他太不自信，不敢发表自己的见解。

(1)diffident about对…缺乏自信心