222 entries under tough topic. ×
| bullhead(adjective, mean, hard, harsh) | |
| capable(adjective, strong, sound, fit) | |
| clear(adjective, complete, severe, total) | |
| cruel(adjective, strong, hard, severe) | |
| deep(adjective, set, clear, severe) | |
| disciplinary(adjective, strong, hard, severe) | |
| dyed-in-the-wool(adjective, close, set, strong, hard) | |
| fierce(adjective, clear, hard, severe) | |
| fit(adjective, strong, complete, solid) | |
| flourishing(strong, fit, solid, fresh) | |
| forbidding(adjective, strong, hard, severe) | |
| full of life(expression, strong, fit, fresh) | |
| hale(strong, sound, fit, heavy) | |
| hard as nails(expression, adjective, idiom, set, strong) | |
| hardboiled(adjective, serious, resolute, persistent) | |
| healthful(strong, fit, fresh, well) | |
| hefty(adjective, strong, hard, sound) | |
| in fine feather(expression, idiom, strong, sound) | |
| in fine fettle(expression, idiom, strong, fit) | |
| in good shape(expression, idiom, strong, fit) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 29 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |