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Incapable of burning.
An incombustible object or material.

in′com·bus′ti·bil′i·ty n.
in′com·bus′ti·bly adv.
References in periodicals archive ?
Indeed, its basic incombustibility has been exhibited over and over again in criminal cases in which the most determined efforts to destroy an inconvenient corpse by fire have repeatedly failed.
Incombustibility, physico-mechanical properties and TVOC emission behavior of the gypsum-rice husk boards for wall and ceiling materials for construction.
Not only is it easily available, it also possesses features like pliability, incombustibility and durability.