11
impassable
7
closed
6
barricaded
5
clogged
4
inaccessible
3
blockaded
3
blocked
1
dammed
1
depthless
1
impenetrable
1
obstructed
0
congested
0
impervious
0
impossible
0
impregnable
0
insurmountable
0
invincible
0
jammed
0
plugged
0
shallow
<12>
11 years ago|754 views|share |citing 
APASmart Define. (2015). navigable thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/navigable/thesaurus/antonyms
ChicagoSmart Define. 2015. "navigable thesaurus" https://smartdefine.org/navigable/thesaurus/antonyms (accessed September 28, 2026).
HarvardSmart Define 2015, navigable thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/navigable/thesaurus/antonyms>.
MLASmart Define. "navigable thesaurus" 13 April 2015. Web. 28 September 2026. <https://smartdefine.org/navigable/thesaurus/antonyms>