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ENGLISH · A WORD WITH POSSIBILITIES

ironclad.

Covered with iron, steel, or (loosely) any other tough metal; armor-plated.

8 characters3 syllables approx.English language

Meaning & usage

adj

  1. Covered with iron, steel, or (loosely) any other tough metal; armor-plated.

    Unlike the average vehicle, cash delivery vans are ironclad and almost unstoppable.

  2. Solid or certain; not able to be disputed or questioned; irrefutable.

    figuratively
    The suspect had an ironclad alibi for his whereabouts on the night of the crime.

  3. Rigorous; severe; exacting.

    figuratively
    an ironclad oath or pledge

  4. Stubborn; inflexible.

    figuratively
Where this word comes from

Etymology tree Proto-Indo-European *h₁ēsh₂r̥no-der.? Proto-Celtic *īsarnombor. Proto-Germanic *īsarną Proto-West Germanic *īsarn Old English īsern Old English īren Middle English iren English iron Proto-Indo-European *gley-der. Proto-Germanic *klaiþijaną Proto-West Germanic *klaiþijan Old English clǣþan Middle English clethen Middle English clad English clad English ironclad From iron + clad.

noun

  1. A ship, vessel, or vehicle with a covering of iron, steel, or (loosely) any other tough metal.

  2. An armor-plated warship, (especially) one preceding the invention of harveyized steel.

  3. A wooden warehouse with an outer skin of corrugated metal.

Where this word comes from

Etymology tree Proto-Indo-European *h₁ēsh₂r̥no-der.? Proto-Celtic *īsarnombor. Proto-Germanic *īsarną Proto-West Germanic *īsarn Old English īsern Old English īren Middle English iren English iron Proto-Indo-European *gley-der. Proto-Germanic *klaiþijaną Proto-West Germanic *klaiþijan Old English clǣþan Middle English clethen Middle English clad English clad English ironclad From iron + clad.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.