incapable of being easily ignited or of burning with extreme rapidity when lighted.
Material unlikely to burn when exposed to flame under most conditions. see also: Flammable
a) Not readily capable of burning with a flame. b) Not liable to ignite and burn when exposed to flame. Its antonym is flammable.
A compound which does not burn in the presence of a flame.
Incombustible, will not burn; opposite of flammable or inflammable.