7
fireproof
4
noncombustible
4
flameproof
3
incombustible
3
nonexplosive(adjective, noncombustible)
2
fire-resistant
2
nonflammable
2
noninflammable
1
fire-resisting
1
fire-resistive
1
fire-retardant
1
flame-retardant
1
nonburnable
1
uninflammable
0
apyrous
0
circulate
0
circulated
0
concrete
0
convey
0
diffuses
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APASmart Define. (2015). combustible thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/combustible/thesaurus/antonyms
ChicagoSmart Define. 2015. "combustible thesaurus" https://smartdefine.org/combustible/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2015, combustible thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/combustible/thesaurus/antonyms>.
MLASmart Define. "combustible thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/combustible/thesaurus/antonyms>