INCOMBUSTIBLE Synonyms: 29 Similar and Opposite Words

incombustible

adjective

ˌin-kəm-ˈbə-stə-bəl

Definition of incombustible

as in noncombustible

incapable of being burned we keep our important papers in an incombustible safe in the basement

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Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of incombustible The Tribune claimed its four-story building constructed of stone, brick and iron at the southeast corner of Dearborn and Madison streets was incombustible. — Chicago Tribune Staff, Chicago Tribune, 22 May 2022 The Chicago Tribune claimed its four-story building constructed of stone, brick and iron at the southeast corner of Dearborn and Madison streets was incombustible. — Kori Rumore, chicagotribune.com, 1 Oct. 2021 In October, scientists announced a new prototype of a lithium-ion battery that’s flexible and incombustible, eliminating in one fell swoop two of the biggest safety complaints about these batteries. — Caroline Delbert, Popular Mechanics, 2 Dec. 2019 Omnis said combustible Reynobond PE material was safe to use on high rise buildings if the insultation material usually put behind the panels was made of incombustible material such as mineral fibre. — Reuters, Fortune, 26 June 2017

Recent Examples of Synonyms for incombustible

Adjective

James Hardie fiber cement siding was selected for its noncombustible, moisture and pest resistance, and ability to stand up to weather extremes.

— Jennifer Castenson, Forbes.com, 20 July 2026
Fire-proofing strategies include using noncombustible materials in decks and fences, moving plants away from houses and limiting the use of certain beloved plants — like rosemary or junipers — because they are known to be flammable.

— Martha Ross, Mercury News, 3 July 2026

Definition of noncombustible

Adjective

Purchases allegedly made by Burke under aliases also included cadaver bags, heavy-duty laundry bags, chain saws, a shovel and a fireproof mat, Byers testified.

— Madeline Morrison, NBC news, 22 July 2026
The Iroquois Theatre fire resulted in reforms such as fireproof scenery and stage curtains, illuminated exits and doors that open outward.

— Kori Rumore, Chicago Tribune, 11 July 2026

Definition of fireproof

Adjective

Residents should clear dead or dying vegetation around their homes, landscape with fire-resistant plants and nonflammable ground cover, and find alternative ways to dispose of landscape debris, according to Cal Fire’s Nevada-Yuba-Placer Unit.

— Haley Parsley, Sacbee.com, 17 June 2026
That’s where nonflammable alternatives become essential.

— Georgina Jedikovska, Interesting Engineering, 6 May 2026

Definition of nonflammable

Browse Nearby Words

incoherent

incombustible

income

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“Incombustible.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/incombustible. Accessed 2 Aug. 2026.

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Synonyms of incombustible

adjective

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