90 entries under adjective topic. ×

18
impenetrable(unaffected, unyielding, safety, unbending)
14
safe(secure, harm, perfect, unaffected)
11
impregnable(strong, secure, resolute, safe)
10
invincible(strong, resolute, unassailable, untouchable)
9
secure(safe, intact, unbroken, protected)
9
unbeatable
8
immune(safe, unaffected, unyielding, unbending)
8
protected(secure, perfect, safe, unaffected)
8
unassailable(strong, sound, secure, resolute)
8
unconquerable
7
indestructible
7
untouchable
6
indomitable(steadfast, unyielding)
6
inviolable(secure, perfect, safe, snug)
6
strong(resolute, unaffected, permanent, resilient)
5
impervious(secure, safe, unaffected, unyielding)
4
defensible
4
tight(close, strong, unaffected, snug)
3
airtight
3
impassable(strong, resolute, unaffected, unyielding)
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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>