123 entries under sturdy topic. ×

2
indomitable(adjective, strong, hard, tough, difficult)
2
serene(adjective, calm, cool, firm, solid)
2
single-minded(adjective, firm, solid, intense, cruel)
2
unvarying(adjective, set, firm, solid, still)
1
ardent(adjective, firm, solid, intense, true)
1
authoritarian(adjective, strong, hard, tough)
1
certain(adjective, firm, solid, determined, usual)
1
cruel(adjective, strong, hard, tough)
1
dyed-in-the-wool(adjective, set, strong, hard, tough)
1
enduring(adjective, firm, solid, determined, steady)
1
hard-boiled(adjective, mean, strong, hard, tough)
1
hard-line(adjective, strong, hard, tough, difficult)
1
never-failing(adjective, firm, solid, intense, stable)
1
regular(adjective, set, firm, solid, determined)
1
reserved(adjective, cool, firm, solid, detached)
1
robust(adjective, strong, hard, secure, tough)
1
self-possessed(adjective, calm, cool, firm, solid)
1
solid as a rock(expression, adjective, idiom, strong, firm)
1
sound(adjective, strong, secure, firm, solid)
1
sure(adjective, strong, firm, solid, true)
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APASmart Define. (2015). immovable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/immovable/thesaurus/synonyms
ChicagoSmart Define. 2015. "immovable thesaurus" https://smartdefine.org/immovable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, immovable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/immovable/thesaurus/synonyms>.
MLASmart Define. "immovable thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/immovable/thesaurus/synonyms>