70 entries under secure topic. ×

12
rooted(adjective, strong, solid, usual)
12
unchangeable(adjective, set, hard, firm)
11
stationary(adjective, move, strong, fixed)
10
motionless(adjective, strong, substantial, fixed)
10
set in stone(expression, adjective, idiom, mean, hard)
10
solid(adjective, strong, firm, steady)
9
tenacious(adjective, strong, firm, solid)
7
impassive(adjective, cool, steady, detached)
7
settled(adjective, strong, firm, solid)
7
static(adjective, set, regular, fixed)
6
anchored(adjective, strong, solid, steady)
6
unmoving(adjective, move, strong, substantial)
5
immotile(adjective, steady, fixed, rigid)
5
still(adjective, rigid, inflexible, passive)
4
quiet(still, rigid, inflexible, stubborn)
4
riveted(adjective, strong, still, substantial)
3
durable(adjective, strong, firm, solid)
3
permanent(adjective, firm, true, steady)
3
strong(adjective, hard, tough, solid)
3
tight(adjective, strong, firm, solid)
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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>