ironclad
noun
- 1
A metal-plated ship, vessel, or vehicle.
- 2
An armor-plated warship.
adjective
- 1
Covered with iron, steel, or some metal, armor-plated.
- 2
Solid or certain; not able to be disputed or questioned; irrefutable.
“The suspect had an ironclad alibi for his whereabouts on the night of the crime.”
- 3
Rigorous; severe; exacting.
“an ironclad oath or pledge”
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