Synonyms|182Antonyms|80|Broader|2Narrower|0Related|667
1
distant
1
fast
1
foggy
1
greaseproof
1
hard(adjective, solid, dense)
1
hazy
1
heavy
1
hermetic(adjective, solid, dense, unaffected, unyielding)
1
impassive(adjective, unaffected, unyielding, unbending, resistant)
1
imperforate
1
impregnable
1
inextricable(adjective, impossibility)
1
innavigable
1
inviolable(adjective, solid, dense)
1
misty
1
mothproof
1
opaque
1
packed
1
punctureproof
1
smoggy
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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>