Synonyms|374Antonyms|68|Broader|6Narrower|0Related|45

45 entries under determined topic. ×

9
indomitable(adjective, strong, firm, steady)
9
pertinacious(adjective, strong, firm, steady)
8
firm(adjective, strong, tough, fit, solid)
8
patient(noun, adjective, strong, firm)
8
unflinching(adjective, set, strong, firm)
8
unremitting(adjective, strong, firm, steady)
7
strenuous(adjective, strong, moving, difficult, energetic)
6
devoted(adjective, strong, firm, steady)
5
active(adjective, strong, moving, difficult, energetic)
5
dedicated(adjective, strong, firm, steady)
5
strong(adjective, sound, tough, fit, firm)
5
unceasing(adjective, strong, firm, steady)
4
continuing(adjective, strong, firm, steady)
3
enthusiastic(adjective, active, resolute, peppy)
3
plodding(adjective, activity, strong, firm)
2
incessant(adjective, strong, firm, steady)
2
plugging(adjective, strong, firm, active)
1
ball of fire(expression, adjective, idiom, strong, lively)
1
continued(adjective, strong, firm, steady)
1
eager beaver(expression, adjective, strong, firm)
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APASmart Define. (2015). indefatigable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/indefatigable/thesaurus/synonyms
ChicagoSmart Define. 2015. "indefatigable thesaurus" https://smartdefine.org/indefatigable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, indefatigable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/indefatigable/thesaurus/synonyms>.
MLASmart Define. "indefatigable thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/indefatigable/thesaurus/synonyms>