119 entries under firm topic. ×

7
stuck(adjective, true, steady, fixed)
7
unswerving(adjective, solid, intense, determined)
6
loyal(adjective, solid, intense, true)
6
refractory(adjective, tough, difficult, determined)
6
stabile(adjective, solid, still, stable)
5
imperturbable(adjective, calm, cool, solid)
4
calm(adjective, cool, solid, still)
4
cool(adjective, calm, solid, steady)
4
equable(adjective, solid, stable, fixed)
4
true(adjective, fixed, resolute, persistent)
4
uncompliant(adjective, hard, determined, resolute)
4
unfaltering(adjective, solid, stable, fixed)
4
unshaken(adjective, solid, stable, fixed)
3
changeless(adjective, set, solid, still)
3
durable(adjective, strong, secure, solid)
3
faithful(adjective, intense, true, fixed)
3
permanent(adjective, secure, true, steady)
3
sedate(adjective, calm, cool, solid)
3
tight(adjective, strong, secure, solid)
3
unchanging(adjective, set, solid, still)
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APASmart Define. (2015). immovable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/immovable/thesaurus/synonyms
ChicagoSmart Define. 2015. "immovable thesaurus" https://smartdefine.org/immovable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, immovable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/immovable/thesaurus/synonyms>.
MLASmart Define. "immovable thesaurus" 3 August 2015. Web. 23 September 2026. <https://smartdefine.org/immovable/thesaurus/synonyms>