103 entries under firm topic. ×

9
secure(verb, adjective, calm, strong, hard)
9
steadfast(adjective, calm, strong, tough)
9
steady(adjective, calm, strong, sound, tough)
8
resolute(adjective, calm, strong, tough)
7
fast(adjective, calm, strong, tough)
7
unswerving(adjective, strong, tough, solid)
7
unwavering(adjective, calm, strong, secure)
6
forceful(adjective, strong, great, sound, tough)
6
inflexible(adjective, close, strong, hard, tough)
5
dependable(adjective, strong, tough, solid)
5
enduring(adjective, calm, strong, sound, secure)
5
rigid(adjective, close, set, strong, hard)
5
unfaltering(adjective, solid, determined, stable)
5
unshakable(adjective, strong, hard, tough, continue)
4
fixed(adjective, close, strong, hard, sound)
4
stubborn(adjective, strong, hard, tough)
4
tight(adjective, close, strong, hard, tough)
4
well-founded(adjective, calm, strong, sound, secure)
3
dense(adjective, person, close, set, body)
3
fresh(adjective, strong, moving, tough, fit)
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APASmart Define. (2016). sturdy thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/sturdy/thesaurus/synonyms
ChicagoSmart Define. 2016. "sturdy thesaurus" https://smartdefine.org/sturdy/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, sturdy thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/sturdy/thesaurus/synonyms>.
MLASmart Define. "sturdy thesaurus" 24 March 2016. Web. 26 September 2026. <https://smartdefine.org/sturdy/thesaurus/synonyms>