338 entries under strong topic. ×
| mulish(adjective, mean, hard, tough) | |
| rigorous(adjective, hard, complete, tough) | |
| unflagging(adjective, tough, fit, solid) | |
| vigorous(adjective, tough, fit, solid) | |
| bold(adjective, vigorous, noble, resolute) | |
| forceful(adjective, clear, sound, heavy) | |
| grim(adjective, hard, tough, severe) | |
| gritty(steady, resolution, bold, resolute) | |
| harsh(adjective, mean, hard, tough) | |
| impervious(adjective, set, hard, tough) | |
| powerful(adjective, sound, tough, fit) | |
| trusty(adjective, good, close, correct) | |
| unbreakable(adjective, hard, tough, severe) | |
| absolute(adjective, clear, complete, easy) | |
| balanced(adjective, calm, secure, easy) | |
| committed(adjective, determined, steady, fixed) | |
| courageous(adjective, determined, vigorous, noble) | |
| dauntless(adjective, vigorous, noble, bold) | |
| hardened(adjective, set, hard, tough) | |
| petrified(adjective, calm, set, hard) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 26 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |