léi​dǎ​bù​dòng

unshakable

雷打不动 雷打不動 léi​dǎ​bù​dòng
unshakable
determined and unyielding in one's will or resolve
unalterable
describes a plan, regulation, or arrangement that must be strictly followed and cannot be changed or canceled regardless of circumstances

Frequency

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

Sources