78 entries under hard topic. ×

5
stumpy(adjective, heavy, short, deep)
5
substantial(adjective, close, set, strong)
4
chunky(adjective, heavy, small, deep)
4
nonporous(solid, rigid, density)
4
rigid(adjective, close, set, strong)
4
secure(verb, adjective, develop, join)
4
stubby(adjective, heavy, small, deep)
3
deep(adjective, set, solid, heavy)
3
solidified(adjective, set, tough, firm)
3
unyielding(adjective, close, set, tough)
2
burly(deep, sturdy, fat, broad)
2
fat(heavy, deep, sturdy, broad)
2
inelastic(adjective, solid, rigid)
2
inflexible(adjective, close, set, strong)
2
iron(adjective, set, strong, firm)
2
massed(adjective, strong, reduce, eliminate)
2
sound(adjective, strong, substantial, tight)
2
stable(adjective, close, strong, firm)
2
strong(adjective, close, set, firm)
2
sturdy(adjective, close, set, strong)
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APASmart Define. (2016). compact thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/compact/thesaurus/synonyms
ChicagoSmart Define. 2016. "compact thesaurus" https://smartdefine.org/compact/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, compact thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/compact/thesaurus/synonyms>.
MLASmart Define. "compact thesaurus" 31 March 2016. Web. 21 September 2026. <https://smartdefine.org/compact/thesaurus/synonyms>