646 entries under adjective topic. ×

6
purposeful(strong, tough, keen, firm)
6
regular(dull, firm, solid, determined)
6
sedulous
6
set in stone(expression, idiom, calm, strong)
6
stony(cold, indifferent, impassive, unyielding)
6
unhesitating(complete, firm, certain, serious)
6
unshaken(clear, strong, flat, firm)
6
unvarying(calm, strong, secure, firm)
6
valiant(strong, firm, noble, bold)
5
adamantine(tough, firm, determined, resolute)
5
allegiant(close, correct, continue, keen)
5
committed(kind, keen, warm, firm)
5
confirmed(certain, determined, usual, steady)
5
continuous(certain, steady, stable, regular)
5
contrary(determined, resolute, persistent, obstinate)
5
deep(clear, tough, severe, determined)
5
earnest(complete, warm, total, sensible)
5
hearty(strong, complete, warm, total)
5
implacable(tough, firm, determined, resolute)
5
incontrovertible(clear, certain, definite, stability)
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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>