174 entries under adjective topic. ×

25
indefatigable(strong, tough, continue, fit)
25
tireless(strong, continue, firm, difficult)
20
untiring(strong, continue, firm, solid)
19
persistent(strong, firm, certain, determined)
18
unfaltering(strong, firm, solid, energetic)
17
unwavering(set, strong, firm, solid)
16
persevering(strong, firm, difficult, energetic)
16
steadfast(perseverance, persevering, tenacious)
16
unfailing(strong, continue, firm, certain)
15
dogged(strong, firm, solid, energetic)
15
resolute(strong, firm, solid, determined)
13
determined(strong, firm, solid, steady)
12
constant(strong, firm, certain, determined)
12
staunch(strong, tough, fit, firm)
12
steady(strong, complete, firm, total)
11
stubborn
11
tenacious(strong, tough, fit, firm)
11
unrelenting(persistent, continuous, perseverance)
11
unswerving(set, strong, complete, firm)
11
unwearying
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APASmart Define. (2015). unflagging thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unflagging/thesaurus/synonyms
ChicagoSmart Define. 2015. "unflagging thesaurus" https://smartdefine.org/unflagging/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, unflagging thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unflagging/thesaurus/synonyms>.
MLASmart Define. "unflagging thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/unflagging/thesaurus/synonyms>