Antonyms of adj noncombustible

1 sense of noncombustible

Sense 1
noncombustible (vs. combustible), incombustible -- (not capable of igniting and burning)

combustible (vs. noncombustible) -- (capable of igniting and burning)
        => burnable, ignitable, ignitible -- (capable of burning)
        => comburent, comburant, combustive -- (supporting combustion)
        => flammable, inflammable -- (easily ignited)
        => ignescent -- (can emit sparks or burst into flame)
        => incendiary -- (capable of catching fire spontaneously or causing fires or burning readily; "an incendiary agent"; "incendiary bombs")

Similarity of adj noncombustible

1 sense of noncombustible

Sense 1
noncombustible (vs. combustible), incombustible -- (not capable of igniting and burning)
       => fireproof -- (impervious to damage by fire)
       => fire-retardant, fire-resistant, fire-resisting, fire-resistive -- (difficult to burn)
       => flameproof, flame-retardant -- (resistant to catching fire)
       => nonflammable -- (impossible to ignite)