fireproof

1 of 2

adjective

fire·​proof ˈfī(-ə)r-ˌprüf 

: proof against or resistant to fire

fireproof

2 of 2

verb

fireproofed; fireproofing; fireproofs

transitive verb

: to make fireproof

Synonyms of fireproof

Adjective

• noncombustible
• incombustible
• nonflammable

Examples of fireproof in a Sentence

Adjective

remember to store valuable papers in a fireproof box

Verb

The building was not fireproofed.

Recent Examples on the Web

Adjective

Ultimately, the Studies Building came to be composed in the International Style out of concrete, stone, wood and transite, a fireproof composite material. — News Desk, Artforum, 7 July 2026

The manufacturer of your gun cabinet should give precise ratings on their fireproof or waterproof limitations. — Bestreviews, Mercury News, 7 July 2026

Verb

Midrange gun cabinets are typically between $200-$500 and can have a keypad or biometric security and store more firearms, but fancier protections like fireproofing and waterproofing add to the cost. — Bestreviews, Mercury News, 7 July 2026

Timberline Glamping identified an issue with a batch of canvas tents that prevent fireproofing and waterproofing treatments from working together, and glampsites using those tents will remain closed. — Christopher Derose, CBS News, 10 June 2026

Word History

First Known Use

Adjective

1610, in the meaning defined above

Verb

1841, in the meaning defined above

Rhymes for fireproof

• bulletproof
• waterproof
• weatherproof
• aloof
• behoof
• disproof
• flameproof
• foolproof
• greaseproof
• leakproof
• reproof
• soundproof

Kids Definition

fireproof

1 of 2 adjective

fire·​proof -ˈprüf 

: not easily burned : made safe against fire

fireproof

2 of 2 verb

: to make fireproof