242 entries under tough topic. ×

5
prosperous(fit, active, healthy, well)
5
red-blooded(adjective, energetic, powerful, lively)
5
reliable(adjective, calm, sound, reasonable)
5
serious(adjective, hard, firm, solid)
5
spanking(adjective, great, energetic, powerful)
5
strict(adjective, hard, severe, flat)
5
thick(adjective, person, body, hard)
5
unswerving(adjective, firm, determined, steady)
4
adamantine(adjective, set, hard, firm)
4
authoritarian(adjective, hard, energetic, powerful)
4
dauntless(adjective, active, noble, bold)
4
exuberant(adjective, energetic, enthusiastic, powerful)
4
fiery(adjective, severe, sharp, difficult)
4
hale and hearty(expression, adjective, idiom, force, power)
4
immovable(adjective, hard, secure, solid)
4
in fine fettle(expression, adjective, idiom, sound)
4
inflexible(adjective, set, hard, flat)
4
rigorous(adjective, hard, severe, sturdy)
4
safe and sound(expression, adjective, idiom, person)
4
steely(adjective, hard, sturdy, rigid)
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APASmart Define. (2016). strong thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/strong/thesaurus/synonyms
ChicagoSmart Define. 2016. "strong thesaurus" https://smartdefine.org/strong/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, strong thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/strong/thesaurus/synonyms>.
MLASmart Define. "strong thesaurus" 1 April 2016. Web. 28 September 2026. <https://smartdefine.org/strong/thesaurus/synonyms>