5 sentences

1. 粗心大意是他最大的毛病。

   cū​xīn dà​yi shì tā zuì dà de máo​bìng.

   Carelessness is his biggest shortcoming.

   Source: Dong Chinese Dictionary

2. 你总是这么粗心。

   nǐ zǒng​shì zhè​me cū​xīn.

   You're always so careless.

   Source: OpenSubtitles

3. 你太粗心了。

   nǐ tài cū​xīn le.

   You're so careless.

   Source: OpenSubtitles

4. 别这么粗心！

   bié zhè​me cū​xīn!

   Don't be so careless!

   Source: Tatoeba

5. 他在考试中因为粗心丢了不少分。

   tā zài kǎo​shì zhōng yīn​wèi cū​xīn diū le bù​shǎo fēn.

   He lost a lot of points in the exam due to carelessness.

   Source: Dong Chinese Dictionary