She is refreshingly informal.

她不拘礼节,让人耳目一新。

His friend was less good-looking, but a lot more informal and relaxed.

他的朋友没那么英俊,却随意、放松得多。

I would like it to be an informal occasion.

我希望把它办得不那么正式。

The house has an informal atmosphere.

房间里有一种轻松随意的氛围。

Most of the time Jenny needs informal clothes.

大部分时间珍妮需要休闲服装。

For lunch, dress is informal.

吃午饭时可以穿休闲服。

The two leaders will retire to Camp David for informal discussions.

两位领导人将到戴维营进行非正式讨论。

...an informal meeting of EU ministers.

欧盟部长非正式会议

We had an informal party at a hotel, and people just flooded in.

我们在宾馆举行了一个非正式的晚会,人们蜂拥而至。