70 entries under secure topic. ×

56
inflexible(adjective, mean, strong, hard)
55
stubborn(adjective, characteristic, quality, mean, strong)
53
firm(noun, adjective, mean, strong, hard)
45
rigid(adjective, mean, strong, hard)
45
obdurate(adjective, strong, hard, tough)
44
resolute(adjective, firm, solid, determined)
43
fixed(adjective, move, mean, strong, hard)
43
uncompromising(adjective, mean, hard, determined)
43
unyielding(adjective, mean, strong, hard)
36
set(adjective, strong, firm, solid)
30
unshakable(adjective, mean, strong, hard)
27
adamant(adjective, mean, strong, hard)
26
steadfast(adjective, move, firm, solid)
18
fast(adjective, strong, firm, solid)
16
unwavering(adjective, firm, solid, determined)
15
stable(adjective, strong, firm, solid)
15
steady(adjective, move, calm, strong, cool)
13
hard-nosed(adjective, mean, strong, hard)
12
constant(adjective, firm, solid, determined)
12
immobile(adjective, move, strong, solid)
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APASmart Define. (2015). immovable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/immovable/thesaurus/synonyms
ChicagoSmart Define. 2015. "immovable thesaurus" https://smartdefine.org/immovable/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, immovable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/immovable/thesaurus/synonyms>.
MLASmart Define. "immovable thesaurus" 3 August 2015. Web. 20 September 2026. <https://smartdefine.org/immovable/thesaurus/synonyms>