8 entries under closed topic. ×

18
impenetrable(adjective, solid, dense, unaffected, unyielding)
12
insurmountable(adjective, do, unreasonable, useless, remote)
5
pathless(adjective, closure)
3
obstructed(adjective, dark, inaccessible)
2
blockaded
2
forbidden
2
untrodden(adjective, closure)
1
trackless
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APASmart Define. (2015). impassable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/impassable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impassable thesaurus" https://smartdefine.org/impassable/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, impassable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/impassable/thesaurus/synonyms>.
MLASmart Define. "impassable thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/impassable/thesaurus/synonyms>