Synonyms|230Antonyms|32|Broader|3Narrower|0Related|172

42 entries under impervious topic. ×

16
impenetrable(adjective, close, hard, tough, solid)
11
tight(adjective, close, solid, short, substantial)
10
compact(adjective, close, set, hard, tough)
8
hermetic(adjective, tight, proof, impenetrable)
8
waterproof(adjective, water, tight, proof)
7
dense(adjective, set, hard, tough, firm)
7
sealed(adjective, tight, proof, impenetrable)
7
thick(adjective, close, set, hard, tough)
7
watertight(adjective, tight, proof, impenetrable)
6
airtight(adjective, tight, proof, impenetrable)
5
inviolable
4
proof(adjective, tight, hermetic)
3
inaccessible(unaffected, unyielding, unbending, resistant)
3
pressure-tight(adjective, tight, proof, hermetic)
3
rainproof(adjective, resistant, watertight, waterproof)
3
solid(adjective, close, set, hard, tough)
2
air-tight(adjective, tight, proof, hermetic)
2
resistant(adjective, proof, unaffected, unyielding, unbending)
2
retentive(adjective, tight, proof, hermetic)
2
water-tight(adjective, tight, proof, hermetic)
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APASmart Define. (2015). impermeable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/impermeable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impermeable thesaurus" https://smartdefine.org/impermeable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, impermeable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/impermeable/thesaurus/synonyms>.
MLASmart Define. "impermeable thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/impermeable/thesaurus/synonyms>