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uncombustible

  • a word derived from combustible.
    combustible
    adjective
    capable of catching fire and burning; inflammable; flammable.

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The situation is comparable to a locomotive with its coal bins leaking, and the coal itself acting as if made of slate or some equally uncombustible or only partially combustible material.

From The Glands Regulating Personality by Louis Berman M.D.