Synonyms|82Antonyms|53|Broader|0Narrower|1Related|402
5
impervious
3
impermeable
2
impenetrable
2
soundproof
1
impassable
1
airtight
1
colorfast
1
fast
1
greaseproof
1
imperviable
1
inaccessible
1
ladder-proof
1
moth-resistant
1
mothproof
1
nonporous
1
proof
1
resistant
1
run-resistant
1
runproof
0
acid-fast
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APASmart Define. (2015). pervious thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/pervious/thesaurus/antonyms
ChicagoSmart Define. 2015. "pervious thesaurus" https://smartdefine.org/pervious/thesaurus/antonyms (accessed September 21, 2026).
HarvardSmart Define 2015, pervious thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/pervious/thesaurus/antonyms>.
MLASmart Define. "pervious thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/pervious/thesaurus/antonyms>