so strong that it cannot be challenged or changed 铁定的；不容置疑的 an ironclad alibi/contract/excuse/guarantee 无懈可击的不在犯罪现场证明；铁定的合同；滴水不漏的理由；斩钉截铁的保证 His memo is ironclad proof he was involved. 他的备忘录是他参与其中的铁证。 🔊🔊
Oxford Collocations DictionaryIronclad is used with these nouns:- alibi
- guarantee
- warship
- …