3
airtight(adjective, certain)
3
impassable(adjective, strong, resolute, unaffected, unyielding)
3
inexpugnable
3
insusceptible(adjective, safe, unaffected, protected, resistant)
3
powerful(adjective, invincible)
3
proof(resistant, impervious)
3
unsusceptible(adjective, safe, unaffected, protected, resistant)
2
defended
2
exempt(adjective, safe, unaffected, protected, resistant)
2
guarded(adjective, secure, perfect, safe, snug)
2
insuperable
2
insurmountable
2
monolithic
2
resistant(adjective, strong, safe, unaffected, unyielding)
2
safeguarded(adjective, secure, safe, snug, intact)
2
sheltered(adjective, secure, safe, snug, intact)
2
shielded(adjective, secure, perfect, safe, snug)
2
sound
2
steadfast
2
unaffected(adjective, safe, unyielding, unbending, protected)
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APASmart Define. (2015). invulnerable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/invulnerable/thesaurus/synonyms
ChicagoSmart Define. 2015. "invulnerable thesaurus" https://smartdefine.org/invulnerable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, invulnerable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/invulnerable/thesaurus/synonyms>.
MLASmart Define. "invulnerable thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/invulnerable/thesaurus/synonyms>