失慎

wǒ yī shí shī shèn dǎ fān le huā píng

我一时失慎打翻了花瓶。

I inadvertently upset a vase.

rú guǒ bù shì shī shèn tā jiù bù huì bǎ hù zhào gǎo diū le

如果不是失慎，他就不会把护照搞丢了。

If he had not been so careless, he would not have lost his passport.

shuō huà shī shèn

说话失慎

make imprudent remarks