「不細心的」究竟是「careless」還是「carefree」?

This word means 「free of worries and responsibilities.」

這個詞的意思是沒有煩惱和責任。

If you had a carefree childhood, it means you enjoyed yourself because you didn't have much stress or worry in your life. A carefree vacation would be a trip on which you stop thinking about work and other obligations.

如果你有一個carefree（無憂無慮的）童年，這意味著你生活中沒有太多的壓力或擔心而且非常享受。一個carefree（無憂無慮的）假期就是你停止思考工作和其他義務的一段旅程。

You can also describe a person as carefree or as having a carefree attitude, meaning that their personality is the type that doesn't worry a lot. 

你可以描述一個人是carefree，或者有carefree的態度，意思是他們是那種不怎麼愛擔心的人。