455 entries under adjective topic. ×

11
abiding(strong, tough, continue, flat)
11
inveterate(usual, obstinate, established, insistent)
11
perennial(continue, constant, continuous, enduring)
11
persisting(strong, tough, firm, determined)
11
recurrent(steady, regular, constant, continuous)
11
regular(usual, steady, routine, normal)
11
single-minded(tough, intense, deliberate, determined)
11
unchangeable(strong, certain, definite, resolute)
10
devoted(strong, firm, determined, steady)
10
immutable(strong, firm, stable, constant)
10
set(strong, tough, flat, firm)
10
unchanging(firm, certain, steady, stable)
9
assiduous
9
faithful(strong, firm, certain, steady)
9
frequent(common, steady, regular, constant)
9
indomitable(strong, firm, determined, steady)
9
industrious(perseverance, hardworking)
9
sedulous
9
tough(firm, unreasonable, grim, resolute)
9
undeviating(strong, flat, intense, certain)
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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>