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

14 entries under closure topic. ×

16
impenetrable(adjective, close, hard, tough, solid)
14
impervious(adjective, hard, solid, fast, short)
7
impassable(adjective, solid, dense, unaffected, unyielding)
3
unpassable
2
imperforate
2
imporous
1
pathless
0
caecal
0
closable
0
invious
0
unpierced
0
untrod
0
untrodden
0
wayless
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APASmart Define. (2015). impermeable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/impermeable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impermeable thesaurus" https://smartdefine.org/impermeable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, impermeable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/impermeable/thesaurus/synonyms>.
MLASmart Define. "impermeable thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/impermeable/thesaurus/synonyms>