30 entries under firm topic. ×

6
thick(adjective, dense, density)
4
compact(adjective, dense, density)
4
hard(adjective, strong, resist, density)
4
impenetrable(adjective, dense, density)
3
concrete(adjective, density)
3
solid(adjective, strong, resist, density)
2
close(adjective, density)
2
dense(adjective, density)
2
nonporous(adjective, density)
2
set
2
solidified(adjective, density)
2
stiff
2
substantial(adjective, density)
1
close-grained
1
concentrated
1
condensed
1
fine-grained
1
heavy(adjective, informal)
1
impermeable(adjective, density)
1
impervious
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APASmart Define. (2013). incompressible thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/incompressible/thesaurus/synonyms
ChicagoSmart Define. 2013. "incompressible thesaurus" https://smartdefine.org/incompressible/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2013, incompressible thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/incompressible/thesaurus/synonyms>.
MLASmart Define. "incompressible thesaurus" 28 June 2013. Web. 29 September 2026. <https://smartdefine.org/incompressible/thesaurus/synonyms>