3 sentences

1. 真不敢相信她这么尖酸刻薄。

   zhēn bù gǎn xiāng​xìn tā zhè​me jiān​suān kè​bó.

   I can't believe how bitter she is.

   Source: OpenSubtitles

2. 由于他说话太刻薄，同事们都不太喜欢他。

   yóu​yú tā shuō​huà tài kè​bó, tóng​shì men dōu bù tài xǐ​huan tā.

   His colleagues don't like him much because he is too caustic.

   Source: Dong Chinese Dictionary

3. 他性格十分刻薄，经常为了一点小事就辱骂员工。

   tā xìng​gé shí​fēn kè​bó, jīng​cháng wèi​le yī​diǎn xiǎo​shì jiù rǔ​mà yuán​gōng.

   He is very mean-spirited and often berates his employees over trivial matters.

   Source: Dong Chinese Dictionary