646 entries under adjective topic. ×

4
intractable(tough, determined, unreasonable, fixed)
4
inveterate(certain, determined, usual, regular)
4
long-lasting(stable, constant, enduring, lasting)
4
motionless(calm, secure, moving, still)
4
never-failing(strong, complete, flat, firm)
4
noble
4
perseverant
4
predictable(good, strong, honest, solid)
4
rooted(secure, certain, determined, usual)
4
severe(persistent, rigid, obstinate, insistent)
4
spunky(resolute, tenacious)
4
thorough(complete, total, definite, resolute)
4
uniform(calm, strong, secure, firm)
4
unmoving(move, calm, still, fixed)
4
unquestioning(set, clear, complete, warm)
4
unremitting(energetic, determined, steady, regular)
4
unwearied
3
accurate(close, complete, correct, firm)
3
assured(set, clear, strong, easy)
3
bound(strong, tough, flat, firm)
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APASmart Define. (2016). steadfast thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/steadfast/thesaurus/synonyms
ChicagoSmart Define. 2016. "steadfast thesaurus" https://smartdefine.org/steadfast/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, steadfast thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/steadfast/thesaurus/synonyms>.
MLASmart Define. "steadfast thesaurus" 11 March 2016. Web. 24 September 2026. <https://smartdefine.org/steadfast/thesaurus/synonyms>