他做事很马虎。

Tā zuòshì hěn mǎhu.

He does things very carelessly.

我是一个很认真的人，做事从来不马虎。

Wǒ shì yí gè hěn rènzhēn de rén, zuòshì cónglái bù mǎhu.

I am a very serious person, I never do things carelessly.

客人对货品的质量要求很高，所以我们绝对不能马虎。

Kèrén duì huòpǐn de zhìliàng yāoqiú hěn gāo, suǒyǐ wǒmen juéduì bù néng mǎhu.

Customers have high requirements for product quality, so we absolutely cannot be sloppy.