incombustible
/ˌɪnkəmˈbʌstəbəl/
adjective
- Not able to be burned; fireproof.
- This incombustible insulation will not catch fire even in a high-temperature environment.
- The building's walls are made of incombustible materials like stone and concrete.
- Firefighters wear incombustible suits to protect themselves from extreme heat.
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