léi​dǎ​bù​dòng

steadfast

雷打不动 (雷打不動) léi​dǎ​bù​dòng
steadfast idiom
firm and resolute, especially referring to a person's habits or determination that remains unchanged by external circumstances
unalterable idiom
describing plans, schedules, or regulations that are fixed and must be followed regardless of the situation

Frequency

Movie subtitles
0.150 per million appears in 0% of films
Written text
0.626 per million

Sources

Definitions
CC-CEDICT