29 entries under density topic. ×

6
close(hard, tough, solid, rigid, inflexible)
6
impenetrable(hard, solid, rigid, resistant, impervious)
6
impermeable(adjective, hard, solid, rigid, resistant)
5
compact(hard, solid, rigid)
5
dense(hard, solid, rigid, resistant, impervious)
4
concrete(hard, tough, solid, rigid, inflexible)
4
thick(hard, solid, rigid, syrupy, jellied)
3
hard(tough, solid, rigid, inflexible)
3
massive
3
solid(hard, rigid, resistant, impervious)
3
substantial(hard, solid, rigid)
2
incompressible(adjective, firm)
2
serried
2
thickset
1
coherent
1
cohesive
1
constipated
1
crystalline
1
gnarled
1
imporous
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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>