646 entries under adjective topic. ×

5
invincible(persistent, obstinate, insistent, dogged)
5
iron(strong, tough, firm, determined)
5
mulish(tough, firm, determined, resolute)
5
pat(firm, solid, determined, usual)
5
patient
5
persisting(strong, tough, firm, determined)
5
positive(good, clear, strong, complete)
5
strict(close, strong, correct, flat)
5
unconquerable(persistent, obstinate, insistent, dogged)
5
unqualified(strong, complete, flat, firm)
5
unswayable(determined, resolute, strict, obstinate)
5
wholehearted(complete, keen, firm, total)
4
balanced(calm, strong, secure, easy)
4
deliberate(intense, determined, resolute, focused)
4
eternal(certain, steady, regular, persistent)
4
everlasting(set, stable, persistent, constant)
4
grim(determined, resolute, uncompromising, unshakeable)
4
hell-bent(fixed, persistent, obstinate, absorbed)
4
hidebound(determined, resolute, persistent, obstinate)
4
industrious(energetic, determined, active, vigorous)
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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>