ironclad

详细解释:a. 装甲的, 铁定的
【法】 打不破, 装甲的, 镶铁的

英语解释：

名词 ironclad:

a wooden warship of the 19th century that is plated with iron or steel armor

形容词 ironclad:

sheathed in iron plates for protectioninflexibly entrenched and unchangeable同义词：brassbound