328 entries under strong topic. ×

3
game(adjective, lively, determined, noble)
3
hard-wearing(adjective, sturdy, robust, rambling)
3
impervious(noun, adjective, set, hard)
3
indefatigable(adjective, sound, fit, firm)
3
insensible(adjective, hard, severe, careless)
3
iron(adjective, mean, hard, firm)
3
valiant(adjective, determined, noble, bold)
3
valorous(adjective, determined, noble, bold)
2
abiding(calm, solid, steady, substantial)
2
active(adjective, sound, fit, difficult)
2
astringent(adjective, hard, severe, harsh)
2
crude(adjective, hard, rude, sturdy)
2
dynamic(adjective, smart, energetic, powerful)
2
fast(adjective, calm, firm, solid)
2
flourishing(adjective, fit, solid, intense)
2
invariable(calm, solid, steady, substantial)
2
kinetic(adjective, moving, informal, energetic)
2
lean(thin, sinewy, wiry)
2
nervy(adjective, smart, energetic, vigorous)
2
perdurable(calm, solid, steady, substantial)
10 years ago|60k views|share |citing 
APASmart Define. (2016). tough thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/tough/thesaurus/synonyms
ChicagoSmart Define. 2016. "tough thesaurus" https://smartdefine.org/tough/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, tough thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/tough/thesaurus/synonyms>.
MLASmart Define. "tough thesaurus" 30 March 2016. Web. 28 September 2026. <https://smartdefine.org/tough/thesaurus/synonyms>