80 entries under rigid topic. ×

15
steady(adjective, move, calm, strong, cool)
13
hard-nosed(adjective, mean, strong, hard, secure)
12
constant(adjective, secure, firm, solid, determined)
12
unchangeable(adjective, set, hard, secure, firm)
11
hard(adjective, mean, strong, tough, cruel)
10
set in stone(expression, adjective, idiom, mean, hard)
10
solid(adjective, strong, secure, firm, steady)
9
pat(adjective, difficult, wild, determined, usual)
8
resolved(adjective, determined, usual, fixed, resolute)
7
hanging tough(expression, adjective, mean, hard, determined)
7
implacable(adjective, mean, strong, hard, tough)
6
iron(adjective, mean, strong, hard, tough)
6
steely(adjective, strong, hard, tough, determined)
6
stiff-necked(adjective, mean, strong, hard, tough)
5
immotile(adjective, secure, steady, fixed)
5
rigorous(adjective, set, strong, hard, tough)
5
stern(adjective, determined, resolute, uncompromising)
5
still(adjective, secure, inflexible, passive)
4
quiet(secure, still, inflexible, stubborn)
4
severe(adjective, strong, hard, tough, cruel)
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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>