ironclad

• 形容事物极其坚固、可靠，无法改变或质疑，常用于协议、论点或防御等。

Describes something that is extremely strong, secure, or impossible to change or challenge, such as an agreement, argument, or protection.

1. Protected by ironC1formal

   Covered or sheathed with iron plates for protection, especially in historical naval contexts.

   铁甲

   • The ironclad warship dominated the seas during the 19th century.
   • They studied the design of an ironclad vessel from the Civil War era.
   • The museum displayed a model of an ironclad battleship.

2. Unbreakable or unchangeableC1formal

   Extremely strong, rigid, or impossible to alter or break.

   坚不可摧或不可改变

   • The contract was ironclad and left no room for negotiation.
   • He provided an ironclad alibi for the time of the crime.
   • The company's policy is ironclad and cannot be changed.

   同义词adamantcast-ironfirmfixedhardimmutableinflexiblerigidsealedunalterableunbreakableunyielding

   反义词changeableflexiblemalleableweakyielding

• 指19世纪一种木质战舰，船体覆盖铁或钢制装甲。

A noun referring to a 19th-century wooden warship that is protected by iron or steel armor plating.

1. Armored warshipC1formal

   A 19th-century wooden warship protected by iron or steel armor plates.

   铁甲舰

   • The ironclad revolutionized naval warfare during the Civil War.
   • The museum displayed a restored ironclad from the 1860s.
   • Both sides deployed ironclads in the famous battle.