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

As for the house, experts advise covering vents where embers could sneak in with mesh, using multi-pane windows that can resist extreme heat, and building walls and roofs out of noncombustible materials.

— Los Angeles Times, Los Angeles Times, 15 Oct. 2026
At the same time, the tobacco landscape has evolved, with noncombustible nicotine products such as e-cigarettes and nicotine pouches becoming increasingly prominent.

— Emma Fenske, The Conversation, 13 Oct. 2026

Definition of noncombustible

Adjective

Viridi spent six years and $10 million figuring out how to make a fireproof container for batteries.

— ABC News, ABC News, 20 Oct. 2026
Much of the Red Barn’s irreplaceable art and ephemera, meticulously and lovingly curated over the years, was lost — but the music series, powered by the fireproof resiliency of those who oversee the collective, barely skipped a beat.

— Aaron Davis, Sacbee.com, 2 Oct. 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

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incoherent

incombustible

income

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“Incombustible.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/incombustible. Accessed 29 Oct. 2026.

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Synonyms of incombustible

adjective

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