86 entries under solid topic. ×

2
single-minded(adjective, firm, intense, cruel)
2
sturdy(adjective, strong, hard, tough, firm)
2
unvarying(adjective, set, firm, still)
1
adjusted(adjective, strong, stable, sure)
1
ardent(adjective, firm, intense, true)
1
bound(adjective, strong, cruel, determined)
1
buttoned down(expression, adjective, strong, stable)
1
certain(adjective, firm, determined, usual)
1
enduring(adjective, firm, determined, steady)
1
entrenched(adjective, firm, determined, usual)
1
fortified(adjective, strong, firm, true)
1
located(secure, firm, stiff, rigid)
1
locked(adjective, strong, secure, steady)
1
nailed(adjective, strong, secure, steady)
1
never-failing(adjective, firm, intense, stable)
1
regular(adjective, set, firm, determined)
1
reserved(adjective, cool, firm, detached)
1
robust(adjective, strong, hard, secure, tough)
1
safe and sound(expression, adjective, idiom, strong)
1
self-possessed(adjective, calm, cool, firm)
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APASmart Define. (2015). immovable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/immovable/thesaurus/synonyms
ChicagoSmart Define. 2015. "immovable thesaurus" https://smartdefine.org/immovable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, immovable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/immovable/thesaurus/synonyms>.
MLASmart Define. "immovable thesaurus" 3 August 2015. Web. 21 September 2026. <https://smartdefine.org/immovable/thesaurus/synonyms>