马虎的英文：
careless
not serious

参考例句：

Be negligent in one's work
工作马虎

I was lax in my duties.
我对本职工作马虎松懈。

She is a proverb for inaccuracy.
她做事马虎是出了名的。

There would be an accident if you drive carelessly like this
马虎驾驶就会酿成车祸。

Be particular about; be earnest about
对于..很认真;一点都不马虎

The author is often negligent in his style.
这位作者的文风常常很马虎。

You ought not to write so carelessly .
你不该写得这样马虎。

tinker with the old clock
马虎地修理旧钟

To administer or manage inefficiently or dishonestly.
对…管理不善不善或马虎地执行或管理

He remonstrated to his wife that she was too careless.
他责备他的妻子太马虎了。

careless是什么意思：
adj. 粗心的；无忧无虑的；漫不经心的

The text was corrupted by careless copyists.
原文因抄写者粗心而有讹误。

He is a careless beggar.
他是个粗心的家伙。

He is a careless profligate.
他是个粗枝大叶的浪荡子。

The accident originated from carelessness.
这意外事件是由于粗心而引起的。

The accident was credited to carelessness on the part of the driver.
这起事故是由于驾车人不小心引起的。

serious是什么意思：
adj. 严肃的，认真的；严重的；危急的；重要的；庄重的

It is a serious article.
这是一篇发人深省的文章。

do not deny that is a serious blow.
我不否认那是严重的一击。

It is a job requiring serious application.
这是一项需要非常勤奋的工作。

A serious misunderstanding fractured their friendship.
一场严重的误会破坏了他们的友谊。

You have to be very serious in trial courts.
在法庭上，你应该态度严肃。