Synonyms|289Antonyms|101|Broader|6Narrower|0Related|320
1
inviolate
1
ironclad
1
irrefutable
1
maintained(adjective, secure, safe, snug, intact)
1
nonperishable
1
okay(adjective, secure, safe, snug, intact)
1
out of danger(expression, idiom, secure, safe, snug)
1
potent
1
preserved(adjective, secure, safe, snug, intact)
1
quenchless
1
rapid
1
reckless
1
resolute(strong, firm, true, fixed, constant)
1
retentive
1
sacrosanct
1
safe and sound(expression, idiom, secure, safe, snug)
1
set(adjective, firm, true, fixed, constant)
1
sheltered(adjective, secure, safe, snug, intact)
1
sitting pretty(expression, adjective, secure, safe, snug)
1
snug(adjective, secure, safe, intact, guarded)
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APASmart Define. (2015). impregnable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/impregnable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impregnable thesaurus" https://smartdefine.org/impregnable/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, impregnable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/impregnable/thesaurus/synonyms>.
MLASmart Define. "impregnable thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/impregnable/thesaurus/synonyms>