353 entries under adjective topic. ×

4
intransigent(steady, fixed, impassive, inflexible)
4
persevering(strong, certain, definite, resolute)
4
relentless(hard, resolute, rigid, inflexible)
4
settled(strong, flat, firm, solid)
4
tenacious(resolute, obstinacy)
4
tough(calm, strong, solid, substantial)
4
unavoidable(certain, unquestionable, undisputable, inevitable)
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unmovable(certain, limited, definite, fixed)
4
unremitting
4
unshakeable
3
ceaseless
3
conservative(moderate, cautious, conventional, traditional)
3
dauntless
3
dedicated
3
deliberate
3
devoted
3
endless
3
habitual
3
headstrong
3
indestructible(unable, lasting)
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APASmart Define. (2015). unchangeable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unchangeable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unchangeable thesaurus" https://smartdefine.org/unchangeable/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, unchangeable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unchangeable/thesaurus/synonyms>.
MLASmart Define. "unchangeable thesaurus" 3 August 2015. Web. 26 September 2026. <https://smartdefine.org/unchangeable/thesaurus/synonyms>