unchangeable
🇺🇸
/ʌnˈtʃeɪndʒəbl/
🇬🇧
/ʌnˈtʃeɪndʒəbl/
Something that cannot be altered or modified in any way.
The unchangeable nature of the contract made us nervous.
合同的不可更改性讓我們感到緊張。