53 entries under solid topic. ×

1
ossified(adjective, set, heavy, deep)
1
refractory(hard, tough, rigid, inflexible)
1
set(adjective, hard, tough, heavy)
1
solidified(adjective, set, hard, tough)
1
sturdy(hard, tough, rigid, inflexible)
1
substantial(hard, tough, sturdy, rigid)
1
syrupy(adjective, set, heavy, deep)
1
thickened(adjective, set, heavy, deep)
1
turbid(adjective, set, heavy, deep)
1
vitrified(adjective, set, heavy, deep)
0
close-grained(hard, tough, rigid, inflexible)
0
fine-grained(hard, tough, rigid, inflexible)
0
inelastic(hard, tough, rigid, inflexible)
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APASmart Define. (2015). impervious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/impervious/thesaurus/synonyms
ChicagoSmart Define. 2015. "impervious thesaurus" https://smartdefine.org/impervious/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, impervious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/impervious/thesaurus/synonyms>.
MLASmart Define. "impervious thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/impervious/thesaurus/synonyms>