11
incombustible(adjective, resistant, insulation, fire extinction, nonflammable)
9
fire-resistant(adjective, resistant)
9
nonflammable(adjective, resistant, insulation, fire extinction)
8
noninflammable(adjective, resistant)
7
flameproof(adjective, insulation, fire extinction)
6
concrete(adjective, resistant)
6
noncandescent(adjective, resistant)
5
asbestos(adjective, resistant)
4
fire-retardant
4
noncombustible(adjective, resistant)
3
strong
3
waterproof
3
weatherproof
2
non-flammable
1
airtight
1
ballproof
1
bombproof
1
bulletproof
1
burglarproof
1
corrosionproof
11 years ago|1.8k views|share |citing 
APASmart Define. (2015). fireproof thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/fireproof/thesaurus/synonyms
ChicagoSmart Define. 2015. "fireproof thesaurus" https://smartdefine.org/fireproof/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, fireproof thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/fireproof/thesaurus/synonyms>.
MLASmart Define. "fireproof thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/fireproof/thesaurus/synonyms>