Careless
Careless是小心的反義詞。如果你careful，那就意味著你做事很用心，想得很多，所以careless意味著做事沒有注意或用心。
例句：
I lost points on the test due to some careless grammar mistakes.
由於一些粗心的語法錯誤，我在考試中丟了分。
Don't be so careless with your cell phone; you might break it.
不要對你的手機這麼粗心；你可能會把它弄壞。
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。
總結
Being careless is negative, it means not giving the necessary attention or thought to your wordsactions. And being carefree is positive; it means feeling nice and light, without stress, worries, or heavy obligations.
Careless是消極的，它意味著你沒有對你的言行給予必要的關注或思考。而carefree是積極的；它意味著感覺很良好和輕鬆，沒有壓力，擔心，或沉重的義務。
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