Synonyms|289Antonyms|101|Broader|6Narrower|0Related|320
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determined
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difficult
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dogged
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doughty
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dreamless
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drive
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endurance
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energy
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extinguishable
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fastened(adjective, firm, true, fixed, constant)
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fastness
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faultless
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fertile
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financially sound(expression, idiom)
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firmly fixed(expression, idiom)
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firmness
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flawless
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flinty
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force
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glued(firm, true, fixed, constant, steadfast)
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APASmart Define. (2015). impregnable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/impregnable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impregnable thesaurus" https://smartdefine.org/impregnable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, impregnable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/impregnable/thesaurus/synonyms>.
MLASmart Define. "impregnable thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/impregnable/thesaurus/synonyms>