Synonyms|182Antonyms|80|Broader|2Narrower|0Related|667
18
impenetrable(adjective, solid, dense, unaffected, unyielding)
12
insurmountable(adjective, do, unreasonable, useless, remote)
11
impervious(adjective, solid, unreasonable, useless, absurd)
10
inaccessible(adjective, unreasonable, useless, out, absurd)
8
dense(adjective, solid, resistant, impervious)
8
indomitable(adjective, steadfast, unyielding, insuperable)
7
impermeable(adjective, solid, dense, unaffected, unyielding)
7
insuperable(adjective, strong, secure, do, resolute)
7
unpassable(adjective, closure)
6
dogged
5
blocked(adjective, dark, inaccessible)
5
pathless(adjective, closure, closed)
5
thick(adjective, solid, dense)
4
all-conquering
4
invincible(adjective, indestructible)
4
resolute
4
unconquerable
3
closed(adjective, dark, inaccessible)
3
obscure(adjective, solid, dense)
3
obstructed(adjective, dark, closed, inaccessible)
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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>