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