328 entries under strong topic. ×
| game(adjective, lively, determined, noble) | |
| hard-wearing(adjective, sturdy, robust, rambling) | |
| impervious(noun, adjective, set, hard) | |
| indefatigable(adjective, sound, fit, firm) | |
| insensible(adjective, hard, severe, careless) | |
| iron(adjective, mean, hard, firm) | |
| valiant(adjective, determined, noble, bold) | |
| valorous(adjective, determined, noble, bold) | |
| abiding(calm, solid, steady, substantial) | |
| active(adjective, sound, fit, difficult) | |
| astringent(adjective, hard, severe, harsh) | |
| crude(adjective, hard, rude, sturdy) | |
| dynamic(adjective, smart, energetic, powerful) | |
| fast(adjective, calm, firm, solid) | |
| flourishing(adjective, fit, solid, intense) | |
| invariable(calm, solid, steady, substantial) | |
| kinetic(adjective, moving, informal, energetic) | |
| lean(thin, sinewy, wiry) | |
| nervy(adjective, smart, energetic, vigorous) | |
| perdurable(calm, solid, steady, substantial) |
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| APA | Smart Define. (2016). tough thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/tough/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "tough thesaurus" https://smartdefine.org/tough/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, tough thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/tough/thesaurus/synonyms>. |
| MLA | Smart Define. "tough thesaurus" 30 March 2016. Web. 28 September 2026. <https://smartdefine.org/tough/thesaurus/synonyms> |