ironclad
adjective C2- Covered with iron, steel, or (loosely) any other tough metal; armor-plated. · Unlike the average vehicle, cash delivery vans are ironclad and almost unstoppable.
- 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.
- Rigorous; severe; exacting. · an ironclad oath or pledge
- Stubborn; inflexible.
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