hèn​tiě​bù​chéng​gāng

to be disappointed that someone falls short of expectations

恨铁不成钢 恨鐵不成鋼 hèn​tiě​bù​chéng​gāng
to be disappointed that someone falls short of expectations
to feel frustrated or impatient that someone has failed to meet one's high expectations for their improvement; literally "to resent that iron does not turn into steel"

Frequency

Written text
0.494 per million

Sources

Frequency data
BCC Corpus (BLCU)