80 entries under reliable topic. ×

70
persistent(adjective, quiet, strong, tough, continue)
65
lasting(verb, adjective, calm, strong, great)
48
firm(adjective, calm, close, strong, sound)
39
constant(adjective, calm, close, strong, secure)
38
consistent(adjective, strong, strain, flat, firm)
37
unfluctuating(adjective, calm, strong, secure, strain)
33
steadfast(adjective, calm, close, strong, complete)
29
abiding(verb, adjective, calm, strong, complete)
27
steady(adjective, calm, close, strong, sound)
24
invariable(adjective, calm, strong, secure, strain)
23
eternal(adjective, certain, pause, steady, stable)
23
fast(adjective, calm, close, strong, secure)
22
stout(adjective, calm, strong, sound, secure)
17
continuing(noun, verb, adjective, increase, strength)
11
unchanging(adjective, close, correct, firm, honest)
10
unwavering(adjective, calm, close, strong, secure)
9
endless(adjective, certain, determined, steady, stable)
8
ceaseless(adjective, certain, steady, persistent, constant)
7
resolute(adjective, calm, close, strong, secure)
7
unchangeable(adjective, calm, strong, secure, flat)
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APASmart Define. (2016). enduring thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/enduring/thesaurus/synonyms
ChicagoSmart Define. 2016. "enduring thesaurus" https://smartdefine.org/enduring/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, enduring thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/enduring/thesaurus/synonyms>.
MLASmart Define. "enduring thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/enduring/thesaurus/synonyms>