I was wrong about it being a casual meeting.

我错认为那是一次非正式的会面。

《柯林斯英汉双解大词典》

She had a purposeful air, and it became evident that this was not a casual visit.

她一副志在必得的样子，显然这不是一次随意造访。

《柯林斯英汉双解大词典》

It was just a casual remark—I wasn't really serious.

我只是随便说说，并不当真。

《牛津词典》

It is written the way people speak, in a casual,relaxed language.

VOA: special.2010.04.18

So the three of us would have a casual and unstructured conversation with the president in what direction he wanna to go.

所以我们三个会随便地,没有系统地聊一下,总统想说什么就说什么。

普林斯顿公开课 - 国际座谈会课程节选

In another situation, you could be at a casual lunch setting with friends, eating pizza.

在另一种情况中，你可能正与朋友一起吃一顿便饭，你们吃的是披萨。

Is it okay 课堂 - SpeakingMax英语口语达人

At a casual glance, much of the fuss now seems to have been about nothing.

ECONOMIST: The birth pangs of a market in higher education

Geox, a casual-footwear brand, is based in the sports-shoe cluster in Montebelluna but manufactures abroad.

ECONOMIST: Italy's business clusters

Post a Casual Encounters ad saying your hubby is willing to pay for a good time.

FORBES: 10 Digital Pranks That Will End Your Relationship