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

The housing equivalent of herd immunity, where enough homes are fireproof that the entire community can be protected against future fires.

From Los Angeles Times • Nov. 12, 2025

“But if you have 30 fireproof homes clustered on two blocks? That’s fascinating.”

From Los Angeles Times • Nov. 12, 2025

White did not realize it at the time, but the Tribune Building and all other fireproof structures had another fatal flaw.

From "The Great Fire" by Jim Murphy