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Adjective: incombustible  ,in-kum'bús-tu-bul
  1. Not capable of igniting and burning
    "Inside stables should be constructed of incombustible material";
    - noncombustible

See also: fireproof, fire-resistant, fire-resisting, fire-resistive, fire-retardant, flameproof, flame-retardant, nonflammable