Synonyms|374Antonyms|68|Broader|6Narrower|0Related|45
2
brisk(adjective, strong, moving, lively, active)
2
careful
2
ceaseless(adjective, continuous)
2
continual(adjective, continuous)
2
decided(adjective, resolute)
2
decisive(adjective, resolute, tenacious)
2
deliberate(adjective, resolute)
2
endless(adjective, continuous)
2
fearless(adjective, resolute)
2
fixed
2
headstrong(adjective, resolute, tenacious)
2
immovable
2
immutable
2
implacable(adjective, resolute)
2
incessant(adjective, strong, firm, determined, steady)
2
inflexible
2
interminable(adjective, continuous)
2
invincible
2
kinetic(adjective, strong, moving, energetic, lively)
2
monotonous(adjective, continuous)
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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>