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

20 entries under substantial topic. ×

16
impenetrable(adjective, close, hard, tough, solid)
11
tight(adjective, close, solid, short)
10
compact(adjective, close, set, hard, tough)
7
close(adjective, set, hard, tough, solid)
7
thick(adjective, close, set, hard, tough)
6
firm(adjective, close, hard, solid, fast)
3
solid(adjective, close, set, hard, tough)
2
congested(adjective, close, solid, short)
2
consolidated(adjective, close, solid, short)
2
crowded(adjective, close, solid, short)
2
jam-packed(adjective, close, solid, short)
2
packed(adjective, close, solid, short)
1
close-grained(adjective, close, set, hard, tough)
1
short(adjective, close, solid, fast)
0
circumscribed(adjective, close, solid, short)
0
confined(adjective, close, solid, short)
0
confining(adjective, close, solid, short)
0
cropped(adjective, close, solid, short)
0
narrow(adjective, close, solid, short)
0
restricted(adjective, close, solid, short)
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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>