62 entries under safe topic. ×

16
impregnable(adjective, strong, secure, resolute)
9
inviolable(adjective, secure, snug, intact)
9
secure(adjective, good, sound, sensible)
9
strong(adjective, sound, secure, resolute)
8
invulnerable(adjective, strong, sound, secure, resolute)
3
firm(adjective, clear, hard, sound, plain)
3
protected(adjective, secure, snug, intact)
3
sound(adjective, good, clear, sensible, certain)
3
steady(adjective, sheltered, protected, locked)
3
sure(adjective, set, certain, true)
2
fixed(adjective, clear, hard, sound, firm)
2
set(adjective, clear, sound, plain, certain)
2
solid(adjective, sheltered, protected, locked)
2
stable(adjective, sheltered, protected, locked)
1
buttoned up(expression, adjective, secure, snug)
1
cherished(adjective, secure, snug, intact)
1
free from danger(expression, idiom, secure, snug)
1
guarded(adjective, secure, snug, intact)
1
home-free(adjective, secure, snug, intact)
1
impervious(adjective, sound, secure, firm)
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APASmart Define. (2015). unassailable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unassailable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unassailable thesaurus" https://smartdefine.org/unassailable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unassailable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unassailable/thesaurus/synonyms>.
MLASmart Define. "unassailable thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/unassailable/thesaurus/synonyms>