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1·It astonishes me (that) he could be so thoughtless.

我真没有料到他会如此轻率。《牛津词典》

2·I seem to be in evil case—and all for an innocent and thoughtless pleasantry.

我似乎陷入了不幸的境地——而这一切都是出于一种天真而轻率的玩笑。

3·How very thoughtless. I'll give him a piece of my mind.

太欠考虑了。我要狠狠地批评他。《柯林斯英汉双解大词典》

4·It was a thoughtless remark and I regretted it immediately.

这是一句欠考虑的话，我马上就后悔了。《柯林斯英汉双解大词典》

5·Very thoughtless of him, I call it.

我认为他太粗心了。

6·How can you be so thoughtless?

你怎么这样不懂事？《新英汉大辞典》

7·It is thoughtless of you to do so.

你这样做，太不懂事。《新英汉大辞典》

8·No, no, don't say it was thoughtless!

不，不，别说那件事是欠考虑的！

9·She forgave him his thoughtless remark.

她原谅了他轻率的话语。

10·That hurt, Bend down, you thoughtless... ow!

弯下身来！你这个粗心鬼…哎唷！