ironclad ['aɪənklæd]

以下由轻松背单词网站提供

adj.装甲的；严格的；n.装甲舰

inflexibly entrenched and unchangeable;

That is an ironclad fact that is beyond controversy.这是铁的事实，无庸置辩。
These ironclad details are irrefutable proof in black and white.白纸黑字，铁证如山。