2
burning(adjective, bright, energetic, passionate, determined)
2
earnest(adjective, vigorous)
2
emphatic(adjective, vigorous)
2
fervent(adjective, vigorous)
2
foolhardy(adjective, courageous, fearless, plucky)
2
forcible(adjective, strong, tough, energetic, powerful)
2
formidable(adjective, strong)
2
fortitudinous(adjective, fear, courageous, fearless, plucky)
2
frisky(adjective, energetic, lively, vigorous, spirited)
2
grainy
2
granular
2
granulose
2
high-strung(adjective, energetic, lively, aggressive, fiery)
2
highflying(adjective, sensibility)
2
husky(adjective, strong)
2
intense(adjective, strong, tough, energetic, powerful)
2
muscular(adjective, strong)
2
rash
2
reckless
2
sinewy(adjective, strong)
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APASmart Define. (2016). mettlesome thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/mettlesome/thesaurus/synonyms
ChicagoSmart Define. 2016. "mettlesome thesaurus" https://smartdefine.org/mettlesome/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, mettlesome thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/mettlesome/thesaurus/synonyms>.
MLASmart Define. "mettlesome thesaurus" 2 March 2016. Web. 29 September 2026. <https://smartdefine.org/mettlesome/thesaurus/synonyms>