78 entries under relentless topic. ×

13
chronic(adjective, continue, usual, regular, routine)
12
eternal(adjective, continue, certain, pause, steady)
12
habitual(adjective, common, usual, steady, regular)
12
inflexible(adjective, strong, tough, flat, firm)
12
obdurate(adjective, strong, tough, flat, firm)
12
uninterrupted(adjective, continue, steady, regular, even)
11
abiding(adjective, strong, tough, continue, flat)
11
persisting(adjective, strong, tough, firm, determined)
11
regular(adjective, usual, steady, routine, normal)
11
single-minded(adjective, tough, intense, deliberate, determined)
10
immutable(adjective, strong, firm, stable, constant)
10
unchanging(adjective, firm, certain, steady, stable)
8
everlasting(adjective, continue, steady, stable, constant)
8
unbroken(adjective, severe, pure, steady, regular)
7
adamant(adjective, strong, tough, flat, firm)
7
inexorable(adjective, tough, determined, unreasonable, grim)
7
unvarying(adjective, steady, regular, even, constant)
6
uniform(adjective, steady, regular, even, constant)
5
even(adjective, steady, regular, constant, uniform)
5
monotonous(adjective, common, regular, normal, constant)
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APASmart Define. (2015). persistent thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/persistent/thesaurus/synonyms
ChicagoSmart Define. 2015. "persistent thesaurus" https://smartdefine.org/persistent/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, persistent thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/persistent/thesaurus/synonyms>.
MLASmart Define. "persistent thesaurus" 1 June 2015. Web. 21 September 2026. <https://smartdefine.org/persistent/thesaurus/synonyms>