23 entries under hardened topic. ×

13
enduring(adjective, continue, familiar, established)
11
long-lasting(adjective, continue, familiar, established)
9
chronic(adjective, persistent, continuous, lasting)
7
continuing(adjective, continue, familiar, persistent, established)
7
long-standing(adjective, continue, persistent, lasting)
7
old(adjective, continue, familiar, established)
7
persistent(adjective, continue, continuous, lasting)
6
abiding(adjective, continue, persistent, lasting)
6
inveterate(adjective, familiar, persistent, established)
4
lifelong(adjective, familiar, persistent, established)
3
persisting(adjective, persistent, continuous, lasting)
2
confirmed(adjective, persistent, continuous, lasting)
2
deep-rooted(adjective, persistent, continuous, lasting)
2
deep-seated(adjective, persistent, continuous, lasting)
2
fixed(adjective, persistent, continuous, lasting)
2
settled(adjective, persistent, continuous, lasting)
1
habitual(persistent, continuous, lasting, continuing)
1
inbred(persistent, continuous, lasting, continuing)
1
incurable(persistent, continuous, lasting, continuing)
1
ineradicable(persistent, continuous, lasting, continuing)
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APASmart Define. (2016). long-lived thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/long-lived/thesaurus/synonyms
ChicagoSmart Define. 2016. "long-lived thesaurus" https://smartdefine.org/long-lived/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, long-lived thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/long-lived/thesaurus/synonyms>.
MLASmart Define. "long-lived thesaurus" 26 February 2016. Web. 28 September 2026. <https://smartdefine.org/long-lived/thesaurus/synonyms>