Synonyms|713Antonyms|152|Broader|9Narrower|8Related|663

45 entries under heavy topic. ×

1
syrupy(adjective, set, solid, deep)
1
thickened(adjective, set, solid, deep)
1
turbid(adjective, dull, set, solid, dark)
1
vitrified(adjective, set, solid, deep)
0
massed(packed, crowded, jam-packed)
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APASmart Define. (2015). impenetrable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/impenetrable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms>