30 entries under solid topic. ×

6
close(hard, tough, rigid, inflexible)
6
impenetrable(hard, rigid, resistant, impervious)
6
impermeable(adjective, hard, rigid, resistant)
5
compact(hard, rigid, density)
5
dense(hard, rigid, resistant, impervious)
5
firm(adjective, hard, rigid, inflexible)
4
concrete(hard, tough, rigid, inflexible)
4
thick(hard, rigid, syrupy, jellied)
3
hard(tough, rigid, inflexible, density)
3
substantial(hard, rigid, density)
2
compressed(hard, tough, rigid, inflexible)
2
concentrated(hard, tough, rigid, inflexible)
2
condensed(hard, tough, rigid, inflexible)
2
heavy(hard, tough, rigid, inflexible)
1
close-grained(hard, tough, rigid, inflexible)
1
congealed(hard, tough, rigid, inflexible)
1
fine-grained(hard, tough, rigid, inflexible)
1
hardened(hard, tough, rigid, inflexible)
1
impervious(hard, tough, rigid, inflexible)
1
inelastic(hard, tough, rigid, inflexible)
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APASmart Define. (2015). nonporous thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/nonporous/thesaurus/synonyms
ChicagoSmart Define. 2015. "nonporous thesaurus" https://smartdefine.org/nonporous/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, nonporous thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/nonporous/thesaurus/synonyms>.
MLASmart Define. "nonporous thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/nonporous/thesaurus/synonyms>