fireproof

American  

[fahyuhr-proof] / ˈfaɪərˌpruf /

adjective

1. resistant to destruction by fire.

2. totally or almost totally unburnable.

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verb (used with object)

1. to make fireproof.

fireproof British  

/ ˈfaɪəˌpruːf /

adjective

1. capable of resisting damage by fire

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verb

1. (tr) to make resistant to fire

Other Word Forms

• nonfireproof adjective
• quasi-fireproof adjective

Etymology

Origin of fireproof

First recorded in 1630–40; fire + -proof

Example Sentences

The Ukrainian president is the same as ever—steadfast, with a nervous system that seems fireproof and capable of withstanding anything.

From The Wall Street Journal • Mar. 18, 2026

His insurance should cover most of the rebuild, which includes pricey fireproof features.

From The Wall Street Journal • Jan. 6, 2026

An initiative that would have required California insurers to offer policies to homeowners who fireproof their houses has been withdrawn after the backer of a competing industry measure similarly did so.

From Los Angeles Times • Dec. 3, 2025

Mesh material and plastic sheets which were found on the outside of the buildings are not believed to be fireproof, while polystyrene was also found on the buildings' windows.

From BBC • Nov. 27, 2025

Beatty, Stoneman, and Black ran up the sidewalk, suddenly odious and fat in the plump fireproof slickers.

From "Fahrenheit 451" by Ray Bradbury