125 entries under solid topic. ×

19
robust(adjective, strong, hard, sound, tough)
19
substantial(adjective, strong, hard, sound, tough)
17
inelastic(adjective, hard, tough, firm)
14
staunch(adjective, clear, strong, sound, tough)
10
stony(adjective, mean, hard, firm, harsh)
8
set in stone(expression, adjective, idiom, set, mean)
7
indurate(adjective, set, mean, hard, firm)
7
sturdy(adjective, set, strong, hard, sound)
6
hardened(adjective, set, hard, tough, firm)
6
stalwart(adjective, strong, hard, sound, tough)
5
dense(adjective, set, strong, hard, tough)
5
impenetrable(adjective, set, hard, tough, firm)
5
impervious(adjective, hard, tough, rigid)
5
rugged(adjective, strong, hard, sound, tough)
4
concrete(adjective, set, hard, tough, firm)
4
stark(adjective, strong, hard, sound, tough)
4
tense(adjective, hard, firm, stiff)
3
compact(adjective, close, set, hard, tough)
3
compressed(adjective, set, hard, tough, firm)
3
condensed(adjective, hard, tough, rigid)
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APASmart Define. (2016). unyielding thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unyielding/thesaurus/synonyms
ChicagoSmart Define. 2016. "unyielding thesaurus" https://smartdefine.org/unyielding/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, unyielding thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unyielding/thesaurus/synonyms>.
MLASmart Define. "unyielding thesaurus" 10 March 2016. Web. 25 September 2026. <https://smartdefine.org/unyielding/thesaurus/synonyms>