3 sentences

1. 他是一个冷酷无情的人。

   tā shì yī gè lěng​kù wú​qíng de rén.

   He is a cold and heartless person.

   Source: Dong Chinese Dictionary

2. 你真是冷酷无情。

   nǐ zhēn shì lěng​kù wú​qíng.

   You're so cold-hearted.

   Source: OpenSubtitles

3. 他对人非常冷酷。

   tā duì rén fēi​cháng lěng​kù.

   He is very ruthless towards people.

   Source: Dong Chinese Dictionary