tiě​shí​xīn​cháng

hard-hearted

铁石心肠 (鐵石心腸) tiě​shí​xīn​cháng
hard-hearted idiom
having a cruel or cold nature; lacking compassion, sympathy, or emotion

He showed a heart of stone toward others' suffering, without any sympathy at all.

Frequency

Movie subtitles
1.61 per million appears in 1% of films
Written text
0.556 per million

Sources

Definitions
CC-CEDICT