455 entries under adjective topic. ×

62
long-standing(continue, strain, firmness, labour)
61
fast(strong, tough, strain, firm)
61
refractory(strain, firmness, labour, hardiness)
59
unalterable(strong, strain, flat, certain)
57
staying(strain, firmness, labour, hardiness)
57
sustained(strain, firmness, constant, continuous)
57
settled(strong, strain, flat, firm)
54
stout(strain, firmness, labour, hardiness)
54
quiescent(strain, firmness, labour, hardiness)
54
resist(verb, strain, firmness, labour)
54
seamless(strain, firmness, continuous, labour)
54
stationary(strain, firmness, labour, hardiness)
54
substantial(strain, firmness, labour, hardiness)
54
tolerant(quiet, understanding, gentle, strain)
54
robust(strain, firmness, labour, hardiness)
54
stabile(strain, steady, regular, firmness)
54
tight(strain, firmness, labour, hardiness)
46
stubborn(characteristic, quality, stubbornness, determined)
38
tenacious(strong, tough, flat, firm)
32
continual(continue, certain, determined, usual)
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APASmart Define. (2015). persistent thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/persistent/thesaurus/synonyms
ChicagoSmart Define. 2015. "persistent thesaurus" https://smartdefine.org/persistent/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, persistent thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/persistent/thesaurus/synonyms>.
MLASmart Define. "persistent thesaurus" 1 June 2015. Web. 20 September 2026. <https://smartdefine.org/persistent/thesaurus/synonyms>