Synonyms|289Antonyms|101|Broader|6Narrower|0Related|320

23 entries under noun topic. ×

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strength
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stronghold
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vigor
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APASmart Define. (2015). impregnable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/impregnable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impregnable thesaurus" https://smartdefine.org/impregnable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, impregnable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/impregnable/thesaurus/synonyms>.
MLASmart Define. "impregnable thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/impregnable/thesaurus/synonyms>