ironclad
🇺🇸
/ˈaɪərnklæd/
🇬🇧
/ˈaɪənklæd/
adjective
R
very strong and impossible to defeat or argue against
The contract is ironclad and guarantees her a portion of the profits.
合同是铁板钉钉的，保证了她能分到一部分利润。
translation
牢不可破