124 entries under hard topic. ×

18
rooted(verb, adjective, strong, secure)
16
unalterable(adjective, strong, secure, severe)
15
secure(adjective, strong, sound, tough)
13
solid(adjective, set, strong, sound)
12
tight(adjective, adverb, close, strong)
11
frozen(adjective, calm, firm, solid)
11
hard-nosed(adjective, mean, secure, rough)
11
set in stone(expression, adjective, idiom, mean)
10
confirmed(verb, adjective, set, complete)
9
dogged(adjective, mean, tough, firm)
9
mulish(adjective, mean, firm, determined)
9
tough(adjective, mean, strong, sound)
7
concentrated(verb, adjective, set, strong)
7
hanging tough(expression, adjective, mean, determined)
7
strong(adjective, sound, secure, tough)
5
close(adjective, set, strong, slight)
5
inalterable(adjective, set, regular, rigid)
5
intractable(adjective, tough, rough, firm)
5
true(adjective, clear, strong, sound)
4
cemented(noun, verb, adjective, strong)
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APASmart Define. (2016). fixed thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/fixed/thesaurus/synonyms
ChicagoSmart Define. 2016. "fixed thesaurus" https://smartdefine.org/fixed/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, fixed thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/fixed/thesaurus/synonyms>.
MLASmart Define. "fixed thesaurus" 16 March 2016. Web. 21 September 2026. <https://smartdefine.org/fixed/thesaurus/synonyms>