111 entries under strong topic. ×

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cemented(secure, substantial, stable, unmoving)
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dense(adjective, hard, tough, sturdy)
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disciplinary(adjective, hard, tough, sturdy)
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embedded(secure, substantial, stable, unmoving)
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ferric(adjective, hard, tough, sturdy)
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ferrous(adjective, hard, tough, sturdy)
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forbidding(adjective, hard, tough, sturdy)
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frowning(adjective, hard, tough, sturdy)
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hang-tough(adjective, hard, tough, sturdy)
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hard-shell(adjective, hard, tough, sturdy)
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heavy(adjective, hard, tough, sturdy)
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insensible(adjective, hard, tough, sturdy)
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mortified(adjective, hard, tough, sturdy)
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mounted(secure, substantial, stable, unmoving)
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petrified(secure, still, substantial, stable)
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rock hard(expression, adjective, hard, tough)
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rough(adjective, hard, tough, sturdy)
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rugged(adjective, hard, tough, sturdy)
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safe(adjective, secure, firm, solid)
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screwed(secure, substantial, stable, unmoving)
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APASmart Define. (2015). immovable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/immovable/thesaurus/synonyms
ChicagoSmart Define. 2015. "immovable thesaurus" https://smartdefine.org/immovable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, immovable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/immovable/thesaurus/synonyms>.
MLASmart Define. "immovable thesaurus" 3 August 2015. Web. 24 September 2026. <https://smartdefine.org/immovable/thesaurus/synonyms>