127 entries under tough topic. ×

9
solid(adjective, strong, sound, complete)
8
flourishing(adjective, strong, great, sound)
8
staunch(noun, adjective, health, strong, sound)
8
tenacious(adjective, strong, sound, fit)
8
virile(adjective, strong, sound, fit)
7
bold(adjective, keen, smart, energetic)
7
durable(adjective, strong, sound, solid)
7
firm(noun, adjective, strong, fit)
7
smart(adjective, keen, sharp, bright)
7
substantial(adjective, strong, sound, complete)
6
hefty(adjective, strong, fit, big)
5
blooming(adjective, good, clear, strong, great)
5
chipper(adjective, good, clear, strong, great)
5
full-bodied(adjective, strong, fit, powerful)
5
hale and hearty(expression, adjective, idiom, strong)
5
in good shape(expression, adjective, idiom, person, strong)
5
live(verb, strong, fit, active)
5
stable(adjective, strong, sound, complete)
4
healthful(health, strong, fit, fresh)
4
in fine fettle(expression, adjective, idiom, strong, sound)
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APASmart Define. (2016). vigorous thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/vigorous/thesaurus/synonyms
ChicagoSmart Define. 2016. "vigorous thesaurus" https://smartdefine.org/vigorous/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, vigorous thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/vigorous/thesaurus/synonyms>.
MLASmart Define. "vigorous thesaurus" 1 April 2016. Web. 29 September 2026. <https://smartdefine.org/vigorous/thesaurus/synonyms>