Synonyms|374Antonyms|68|Broader|6Narrower|0Related|45
6
devoted(adjective, strong, firm, determined, steady)
6
enduring(adjective, set, strong, fit, healthy)
6
faithful(adjective, resolute, tenacious)
6
insistent(adjective, resolute, tenacious)
6
laborious(adjective, hardworking)
6
stalwart(adjective, strong, sound, tough, fit)
6
undaunted(adjective, tenacious)
6
undeviating(adjective, continuous)
6
zealous(adjective, resolute)
5
active(adjective, strong, moving, difficult, energetic)
5
brave
5
dedicated(adjective, strong, firm, determined, steady)
5
dynamic(adjective, strong, moving, lively, active)
5
earnest(adjective, resolute)
5
hardworking
5
obstinate(adjective, tenacious)
5
perseverant
5
strong(adjective, sound, tough, fit, firm)
5
thorough(adjective, resolute)
5
unceasing(adjective, strong, firm, determined, steady)
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APASmart Define. (2015). indefatigable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/indefatigable/thesaurus/synonyms
ChicagoSmart Define. 2015. "indefatigable thesaurus" https://smartdefine.org/indefatigable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, indefatigable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/indefatigable/thesaurus/synonyms>.
MLASmart Define. "indefatigable thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/indefatigable/thesaurus/synonyms>