Incombustible

[in-kuh m-buhs-tuh-buh l] /ˌɪn kəmˈbʌs tə bəl/

adjective
1.
not combustible; incapable of being burned; fireproof.
noun
2.
an incombustible substance.
/ˌɪnkəmˈbʌstəbəl/
adjective
1.
not capable of being burnt; fireproof
noun
2.
an incombustible object or material
adj.

late 15c., from Old French incombustible (14c.) or directly from Medieval Latin incombustibilis; see in- (1) + combustible.

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