Synonyms|182Antonyms|80|Broader|2Narrower|0Related|667
1
smoky
1
soundproof
1
soupy
1
trackless(adjective, closed)
1
unachievable
1
unapproachable(unaffected, unyielding, unbending, resistant, unreceptive)
1
unbridgeable
1
unclimbable
1
uncomeatable
1
unnavigable
1
untraversable
1
watertight(unaffected, unyielding, unbending, resistant, impervious)
1
weatherproof
0
Delphic(adjective, solid, dense)
0
airproof
0
airtight
0
arcane(adjective, solid, dense)
0
arterial
0
baffling(adjective, solid, dense)
0
bafflingly
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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>