ironclad

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++i·ron·clad /ˈaɪənˌklæd $ -ərn-/ adjective  1  an ironclad agreement, proof, defence etc is so strong and sure that it cannot be changed or argued against 〔协议、证据、辩词等〕不能改变的，无法反对的，铁定的 an ironclad guarantee 绝对的保证2  old-fashioned covered with iron 装甲的 an ironclad battleship 装甲战列舰

Examples from the Corpus

ironclad• Suffice it to say the case against him was not exactly ironclad and that he was not represented by the Dream Team.• She said she made sure she had an ironclad prenuptial agreement.• It dramatized the superiority of ironclad warships over wooden ones.

i·ron·clad adjectiveChineseSyllable  

Corpus agreement, so defence proof, etc strong ironclad an is and

ironclad
i‧ron‧clad /ˈaɪənˌklæd $ -ərn-/ adjective
1. an ironclad agreement, proof, defence etc is so strong and sure that it cannot be changed or argued against:
    an ironclad guarantee
2. old-fashioned covered with iron:
    an ironclad battleship

iron·cladBrE /ˈaɪənklæd/ 🔊NAmE /ˈaɪərnklæd/ 🔊 adjectiveso 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。🔊🔊  ➡  compare cast-iron (2)