A heart of stone
Iron heart, a Chinese idiom, Pinyin is ti ě x ī NSH í ch á ng, meaning iron heart. It comes from the peony narration by Su Shi of Song Dynasty.
Idiom usage
Sister purple cuckoo, you've never been so hard hearted. Why haven't you said a good word to me recently?
Analysis of Idioms
Synonyms: heart of stone, heart of heart, heart of stone
The origin of Idioms
Song Sushi's peony Narration: "however, lumenzi often blames song Guangping for being a man with a firm heart and a stony heart, while his plum blossom Fu is clear and gorgeous, and has the style of Xu Yu in the Southern Dynasty."
Idiom explanation
He has a heart of stone.
A heart of stone
too observant of conventional standards - xún guī dǎo jǔ