Synonyms|182Antonyms|80|Broader|2Narrower|0Related|667
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enigmatic(adjective, solid, dense)
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enigmatical(adjective, solid, dense)
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extremely
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firm(adjective, solid, dense)
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hidden(adjective, solid, dense)
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hopeless
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immune(unaffected, unyielding, unbending, resistant, unreceptive)
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imporous
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impracticable unachievable(expression, idiom, impossibility)
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inapproachable(adjective, inaccessible)
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incognizable(adjective, solid, dense)
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incompatible
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indestructible
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indiscernible(adjective, solid, dense)
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inexplicable(adjective, solid, dense)
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infeasible
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inscrutable(adjective, solid, dense)
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invious
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irresoluble
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irresolvable
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APASmart Define. (2015). impassable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/impassable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impassable thesaurus" https://smartdefine.org/impassable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, impassable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/impassable/thesaurus/synonyms>.
MLASmart Define. "impassable thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/impassable/thesaurus/synonyms>