53 entries under hard topic. ×

12
compressed(verb, adjective, set, strong)
9
concentrated(verb, adjective, set, strong)
7
compact(adjective, set, strong, firm)
6
packed(verb, adjective, set, strong)
6
solid(adjective, set, strong, firm)
5
close(adjective, strong, solid, substantial)
5
consolidated(verb, adjective, set, strong)
4
dense(adjective, set, strong, firm)
4
firm(adjective, set, strong, solid)
3
thick(adjective, strong, firm, solid)
2
concrete(adjective, strong, substantial, sturdy)
2
hardened(verb, adjective, set, strong)
2
heavy(adjective, strong, substantial, compact)
2
impenetrable(adjective, set, strong, firm)
2
substantial(adjective, strong, compact, tight)
1
brick wall(expression, adjective, strong, substantial)
1
dimensional(adjective, strong, substantial, sturdy)
1
fixed(adjective, strong, substantial, sturdy)
1
hefty(adjective, strong, substantial, sturdy)
1
hulk(adjective, strong, substantial, sturdy)
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APASmart Define. (2015). compacted thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/compacted/thesaurus/synonyms
ChicagoSmart Define. 2015. "compacted thesaurus" https://smartdefine.org/compacted/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, compacted thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/compacted/thesaurus/synonyms>.
MLASmart Define. "compacted thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/compacted/thesaurus/synonyms>