1
implied(complete, firm, certain, obedient, wholehearted)
1
in equilibrium
1
inarticulate(complete, firm, certain, obedient, wholehearted)
1
incontestible
1
indisputable(clear, certain, definite, established, accurate)
1
indubitable(clear, certain, definite, established, accurate)
1
indurate(adjective, mean, hard, tough, harsh)
1
inert
1
inevitable(complete, firm, certain, obedient, wholehearted)
1
inferential(complete, firm, certain, obedient, wholehearted)
1
inferred(adjective, complete, firm, certain, obedient)
1
insubordinate(tough, firm, unreasonable, grim, inflexible)
1
insuperable
1
intense
1
intractable(adjective, tough, firm, unreasonable, grim)
1
invariant
1
iron(adjective, mean, strong, hard, tough)
1
latent(complete, firm, certain, obedient, wholehearted)
1
level
1
massed(adjective, strong, hard, substantial, sturdy)
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APASmart Define. (2015). unshakable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unshakable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unshakable thesaurus" https://smartdefine.org/unshakable/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, unshakable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unshakable/thesaurus/synonyms>.
MLASmart Define. "unshakable thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/unshakable/thesaurus/synonyms>