170 entries under vigorous topic. ×

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zealous(adjective, strong, tough, energetic, enthusiastic)
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trim(adjective, strong, great, sound, tough)
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affable(adjective, enthusiastic, sincere, wholehearted)
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ardent(adjective, enthusiastic, sincere, wholehearted)
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avid(adjective, enthusiastic, sincere, wholehearted)
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back-slapping(adjective, enthusiastic, sincere, wholehearted)
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bruising(strong, sturdy, brawny, husky)
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cheerful(adjective, enthusiastic, sincere, wholehearted)
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cheery(adjective, enthusiastic, sincere, wholehearted)
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cordial(adjective, enthusiastic, sincere, wholehearted)
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deep-felt(adjective, enthusiastic, sincere, wholehearted)
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deepest(adjective, enthusiastic, sincere, wholehearted)
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devout(adjective, enthusiastic, sincere, wholehearted)
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dynamical
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earnest(adjective, enthusiastic, sincere, wholehearted)
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ebullient(adjective, enthusiastic, sincere, wholehearted)
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effusive(adjective, enthusiastic, sincere, wholehearted)
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emphatic(adjective, strong, enthusiastic, sincere)
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fibrous(sturdy, brawny, well-built, beefy)
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frank(adjective, enthusiastic, sincere, wholehearted)
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APASmart Define. (2016). robust thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/robust/thesaurus/synonyms
ChicagoSmart Define. 2016. "robust thesaurus" https://smartdefine.org/robust/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, robust thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/robust/thesaurus/synonyms>.
MLASmart Define. "robust thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/robust/thesaurus/synonyms>