30 entries under hard topic. ×

2
substantial(solid, heavy, rigid, thick)
2
tough(adjective, solid, rigid, inflexible)
1
close-grained(tough, solid, rigid, inflexible)
1
congealed(noun, verb, adjective, set)
1
fine-grained(tough, solid, rigid, inflexible)
1
impervious(adjective, set, tough, solid)
1
jelled(verb, adjective, set, tough)
1
set(verb, adjective, tough, solid)
0
refractory(tough, solid, rigid, inflexible)
0
sturdy(tough, solid, rigid, inflexible)
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APASmart Define. (2015). condensed thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/condensed/thesaurus/synonyms
ChicagoSmart Define. 2015. "condensed thesaurus" https://smartdefine.org/condensed/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, condensed thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/condensed/thesaurus/synonyms>.
MLASmart Define. "condensed thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/condensed/thesaurus/synonyms>