222 entries under tough topic. ×
| unmanageable(adjective, persistent, obstinate, stubborn) | |
| able-bodied(adjective, strong, sound, fit) | |
| authoritarian(adjective, strong, hard, severe) | |
| bullheaded(adjective, strong, hard, determined) | |
| dead set(expression, adjective, severe, harsh) | |
| eager(adjective, clear, severe, determined) | |
| everlasting(adjective, strong, persistent, continuous) | |
| exacting(adjective, hard, severe, rough) | |
| hard-line(adjective, strong, hard, severe) | |
| hard-shelled(adjective, hard, severe, rough) | |
| hardheaded(adjective, strong, hard, determined) | |
| husky(adjective, strong, hard, fit) | |
| intense(adjective, clear, severe, harsh) | |
| keen(adjective, clear, severe, determined) | |
| muscular(adjective, strong, sound, fit) | |
| normal(adjective, strong, fit, lively) | |
| pigheaded(adjective, mean, hard, determined) | |
| sinewy(adjective, strong, stringy) | |
| stark(adjective, strong, hard, sound) | |
| virile(adjective, strong, fit, vigorous) |
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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> |