I felt ill at ease in such formal clothes.

我穿着这样正式的衣服觉得很拘谨。

《牛津词典》

She feels ill at ease in strange surroundings.

她在陌生的环境中感觉不自在。

youdao

History teaches that a strong and confident nation is at ease in hearing from the outside world.

历史告诉我们：一个强大自信的民族学起外面的世界易如反掌。

youdao

It also organizes programs to help foreign students feel more at ease in their new surroundings.

VOA: special.2009.03.19

He felt perfectly at ease. He had only to look at his tuxedo to know he belonged with all the other beautiful people in the opera house.

VOA: special.2009.04.11

Not everyone in the military, however,is at ease with social media.

VOA: special.2009.09.14

Ms. Moore and other senior photographers try to put teens at ease in front of the camera.

WSJ: Best High-School Pictures Ever

The Taliban's grip on Kabul is all the tighter because they are ill at ease in the capital.

ECONOMIST: Afghanistan

The Czech player was even more at ease in the second tie-break, winning it with the loss of just two points.

BBC: Johansson crashes out in Moscow