IPA: /nɒnˈbɜːrnəbl/
KK: /nɑnˈbɜrnəbl/
Something that cannot catch fire or be burned.
The building materials used in the construction were nonburnable to ensure safety.
Nonburnable → It is formed from "non-" (meaning not) and "burnable" (from "burn" which comes from Old English "byrnan", meaning to consume with fire, and the suffix "-able" meaning capable of). The word "nonburnable" means not capable of being consumed by fire.
Think of 'not' ('non-') being added to 'capable of burning' ('burnable') — that's why nonburnable means something that cannot catch fire.