1
sitting pretty(expression, adjective, secure, safe, snug)
1
snug(adjective, close, strong, secure, firm)
1
solid
1
stable
1
steady
1
tenable
1
tended(adjective, secure, safe, snug, intact)
1
tough(strong, resolute, unaffected, permanent, resilient)
1
trustworthy
1
unanswerable(adjective, safe, unaffected, protected, resistant)
1
unasked
1
unattackable
1
unbending(adjective, unyielding, unreceptive)
1
unbreakable(adjective, strong, tough)
1
undamaged(adjective, secure, perfect, safe, snug)
1
undampable
1
undangerous
1
under lock and key(expression, idiom, secure, safe, snug)
1
undestroyable
1
undying
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APASmart Define. (2015). invulnerable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/invulnerable/thesaurus/synonyms
ChicagoSmart Define. 2015. "invulnerable thesaurus" https://smartdefine.org/invulnerable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, invulnerable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/invulnerable/thesaurus/synonyms>.
MLASmart Define. "invulnerable thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/invulnerable/thesaurus/synonyms>