193 entries under determined topic. ×

5
iron(adjective, strong, tough, firm)
5
mulish(adjective, tough, firm, resolute)
5
pat(adjective, firm, solid, usual)
5
persisting(adjective, strong, tough, firm)
5
positive(adjective, good, clear, strong, complete)
5
strict(adjective, close, strong, correct, flat)
5
unqualified(adjective, strong, complete, flat, firm)
5
unswayable(adjective, resolute, strict, obstinate)
4
deliberate(adjective, intense, resolute, focused)
4
grim(adjective, resolute, uncompromising, unshakeable)
4
hidebound(adjective, resolute, persistent, obstinate)
4
industrious(adjective, energetic, active, vigorous)
4
intractable(adjective, tough, unreasonable, fixed)
4
inveterate(adjective, certain, usual, regular)
4
never-failing(adjective, strong, complete, flat, firm)
4
rooted(adjective, secure, certain, usual)
4
unremitting(adjective, energetic, steady, regular)
3
bound(adjective, strong, tough, flat, firm)
3
bullheaded(adjective, tough, firm, resolute)
3
clear(adjective, set, complete, tough, severe)
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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>