42 entries under bouncing topic. ×

35
tireless(adjective, strong, continue, firm, difficult)
27
unflagging(adjective, strong, tough, continue, fit)
21
untiring(adjective, strong, continue, lively, determined)
11
industrious(adjective, activity, strong, difficult, energetic)
11
vigorous(adjective, strong, sound, tough, fit)
7
strenuous(adjective, strong, moving, difficult, energetic)
6
stalwart(adjective, strong, sound, tough, fit)
5
active(adjective, strong, moving, difficult, energetic)
5
dynamic(adjective, strong, moving, lively, active)
5
strong(adjective, sound, tough, fit, firm)
4
spirited(adjective, strong, moving, lively, active)
3
enterprising(adjective, strong, moving, lively, active)
3
enthusiastic(adjective, determined, active, resolute, peppy)
3
lively(adjective, strong, moving, active, vigorous)
3
tough(adjective, strong, sound, fit, firm)
3
vital(adjective, strong, tough, fit, lively)
2
aggressive(adjective, strong, moving, lively, active)
2
animated(adjective, strong, moving, lively, active)
2
brisk(adjective, strong, moving, lively, active)
2
kinetic(adjective, strong, moving, energetic, lively)
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APASmart Define. (2015). indefatigable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/indefatigable/thesaurus/synonyms
ChicagoSmart Define. 2015. "indefatigable thesaurus" https://smartdefine.org/indefatigable/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, indefatigable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/indefatigable/thesaurus/synonyms>.
MLASmart Define. "indefatigable thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/indefatigable/thesaurus/synonyms>