嘴直

bié guài wǒ zuǐ zhí zhè jiù shì nǐ de cuò

别怪我嘴直，这就是你的错。

Don't blame me for my bluntness. It's your fault.

tā yī zhí dōu xīn zhí zuǐ zhí

她一直都心直嘴直。

She is straightforward and blunt as always.