2
blind
2
incapable
2
unimpressionable(adjective, dead, insensitive, insusceptible)
1
airtight
1
fireproof
1
flameproof
1
foolproof
1
hermetic
1
impervious
1
insensitive(adjective, dead, numb, insensible, insusceptible)
1
leakproof
1
noiseproof
1
proof
1
punctureproof
1
resistant
1
shatterproof
1
soundproof
1
tight
1
unsusceptible(adjective, dead, insensitive, insusceptible)
1
watertight
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APASmart Define. (2015). impervious to thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/impervious_to/thesaurus/synonyms
ChicagoSmart Define. 2015. "impervious to thesaurus" https://smartdefine.org/impervious_to/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, impervious to thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/impervious_to/thesaurus/synonyms>.
MLASmart Define. "impervious to thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/impervious_to/thesaurus/synonyms>