30 entries under hard topic. ×

4
close-grained(adjective, tough, solid, rigid)
2
firm(adjective, solid, rigid, inflexible)
1
close(tough, solid, rigid, inflexible)
1
compressed(tough, solid, rigid, inflexible)
1
concentrated(tough, solid, rigid, inflexible)
1
concrete(tough, solid, rigid, inflexible)
1
condensed(tough, solid, rigid, inflexible)
1
congealed(tough, solid, rigid, inflexible)
1
hardened(tough, solid, rigid, inflexible)
1
impervious(tough, solid, rigid, inflexible)
1
inelastic(tough, solid, rigid, inflexible)
1
jelled(tough, solid, rigid, inflexible)
1
nonporous(tough, solid, rigid, inflexible)
1
refractory(tough, solid, rigid, inflexible)
1
set(tough, solid, rigid, inflexible)
1
solidified(tough, solid, rigid, inflexible)
1
stiff(tough, solid, rigid, inflexible)
1
sturdy(tough, solid, rigid, inflexible)
1
thick(solid, rigid, syrupy, jellied)
1
unyielding(tough, solid, rigid, inflexible)
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APASmart Define. (2015). fine-grained thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/fine-grained/thesaurus/synonyms
ChicagoSmart Define. 2015. "fine-grained thesaurus" https://smartdefine.org/fine-grained/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, fine-grained thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/fine-grained/thesaurus/synonyms>.
MLASmart Define. "fine-grained thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/fine-grained/thesaurus/synonyms>