78 entries under hard topic. ×

24
dense(adjective, set, tough, firm)
22
thick(adjective, close, tough, firm)
20
condensed(adjective, close, set, tough)
20
solid(adjective, close, set, tough)
18
close(adjective, set, fix, settle)
18
compressed(adjective, set, tough, firm)
16
tight(adjective, close, warm, firm)
14
firm(noun, adjective, close, set, fix)
14
impenetrable(adjective, close, set, tough)
12
concentrated(adjective, set, strong, tough)
8
set(verb, adjective, close, fix)
7
compacted(adjective, set, strong, firm)
7
concrete(verb, adjective, close, set)
7
heavy(adjective, set, strong, tough)
7
stiff(adjective, set, tough, firm)
7
stocky(adjective, heavy, small, deep)
6
consolidated(adjective, close, set, strong)
5
impermeable(adjective, close, set, tough)
5
massive(adjective, deep, fat, broad)
5
squat(adjective, heavy, small, short)
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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>