Synonyms

fireproof

American

[fahyuhr-proof] / ˈfaɪərˌpruf /

adjective

resistant to destruction by fire.
totally or almost totally unburnable.

verb (used with object)

to make fireproof.

fireproof British

/ ˈfaɪəˌpruːf /

adjective

capable of resisting damage by fire

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

verb

(tr) to make resistant to fire

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

nonfireproof adjective
quasi-fireproof adjective

Etymology

Origin of fireproof

First recorded in 1630–40; fire + -proof

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

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

But if you build enough fireproof homes to achieve herd immunity, Mercury can justify insuring more homes — and at cheaper rates.

From Los Angeles Times • Nov. 12, 2025

“No. Houses. have always been fireproof, take my word for it.”

From "Fahrenheit 451" by Ray Bradbury

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023