Part of speech:
Not flammable, especially not readily ignited and not rapidly burned.
The definition of combustible is something that is prone to catching fire or is being excitable or easily annoyed.
Find another word for incombustible. In this page you can discover 5 synonyms, antonyms, idiomatic expressions, and related words for incombustible, like: nonflammable, noncombustible, unburnable, fireproof and combustible.