646 entries under adjective topic. ×

22
refractory(strain, firmness, labour, hardiness)
22
resistant(strain, firmness, labour, hardiness)
22
set(verb, calm, strong, secure)
22
stationary(move, strain, firmness, labour)
22
stout(calm, strong, tough, strain)
22
substantial(calm, strong, secure, strain)
22
unbending(clear, strong, tough, severe)
21
obstinate(strong, tough, firm, intense)
21
perpetual(strain, determined, steady, stable)
21
tight(strain, firmness, rigid, labour)
20
impregnable(strain, firmness, labour, hardiness)
20
quiescent(strain, firmness, labour, hardiness)
20
resolved(strong, flat, firm, certain)
20
stabile(calm, strong, secure, strain)
20
sustained(strain, firmness, persistent, continuous)
19
adamant(strong, secure, tough, flat)
19
inexorable(firm, determined, steady, resolute)
19
staying(strain, firmness, labour, hardiness)
19
true(good, close, strong, kind)
19
unshakable(firm, determined, resolute, obstinate)
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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>