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6
aggressive(adjective, strong, energetic, lively)
6
ardent(adjective, difficult, energetic, vigorous)
6
brisk(adjective, action, strong, tough, intense)
6
kinetic(adjective, action, strong, moving, energetic)
6
zippy(adjective, strong, tough, energetic, powerful)
5
enterprising(adjective, activity, strong, tough, smart)
5
enthusiastic(adjective, determined, vigorous, resolute)
5
indefatigable(adjective, strong, moving, difficult, energetic)
5
mettlesome(adjective, strong, tough, intense, energetic)
5
red-blooded(adjective, strong, tough, intense, energetic)
4
hearty(adjective, strong, tough, intense, energetic)
4
robust(adjective, strong, tough, intense, energetic)
4
sprightly(adjective, action, strong, moving, lively)
3
bold(adjective, tough, smart, energetic)
3
vehement(adjective, difficult, intense, energetic, lively)
2
athletic(adjective, strong, tough, intense, energetic)
2
exuberant(adjective, strong, tough, intense, energetic)
2
forcible(adjective, strong, tough, energetic, powerful)
2
potent(adjective, strong, tough, energetic, powerful)
2
snappy(adjective, strong, tough, energetic, powerful)
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APASmart Define. (2016). strenuous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/strenuous/thesaurus/synonyms
ChicagoSmart Define. 2016. "strenuous thesaurus" https://smartdefine.org/strenuous/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, strenuous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/strenuous/thesaurus/synonyms>.
MLASmart Define. "strenuous thesaurus" 1 April 2016. Web. 24 September 2026. <https://smartdefine.org/strenuous/thesaurus/synonyms>