72 entries under adjective topic. ×

19
unyielding(strain, firmness, labour, hardiness)
19
well-established(strain, firmness, labour, hardiness)
18
fast(strain, firmness, labour, hardiness)
18
stabile(strain, firmness, labour, hardiness)
18
stationary(strain, firmness, labour, hardiness)
18
stout(strain, firmness, labour, hardiness)
18
substantial(strain, firmness, labour, hardiness)
18
sustained(strain, firmness, labour, hardiness)
7
long-lasting(continue, existing)
7
long-lived(continue, persistent, hardened, lasting)
6
abiding(continue, steady, even, hardened)
6
continuing(continue, persistent, continuous, hardened)
5
chronic(persistent, continuous, hardened, lasting)
5
fixed(complete, true, persistent, customary)
5
perdurable(continue, steady, even, unchanging)
4
inveterate(persistent, continuous, hardened, lasting)
4
perennial(continue, persistent, continuous, hardened)
4
traditional
3
old(continue, customary, hardened, traditional)
3
persisting(persistent, continuous, hardened, lasting)
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APASmart Define. (2015). long-standing thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/long-standing/thesaurus/synonyms
ChicagoSmart Define. 2015. "long-standing thesaurus" https://smartdefine.org/long-standing/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, long-standing thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/long-standing/thesaurus/synonyms>.
MLASmart Define. "long-standing thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/long-standing/thesaurus/synonyms>