338 entries under strong topic. ×
| hardheaded(adjective, hard, tough, determined) | |
| husky(adjective, hard, tough, fit) | |
| intrepid(determined, vigorous, noble, bold) | |
| material(adjective, hard, solid, physical) | |
| muscular(adjective, sound, tough, fit) | |
| nailed(adjective, calm, secure, solid) | |
| normal(adjective, tough, fit, lively) | |
| patient(adjective, determined, steady, constant) | |
| riveted(adjective, secure, determined, steady) | |
| safe(adjective, calm, good, clear) | |
| sinewy(adjective, tough, stringy) | |
| stark(adjective, hard, sound, tough) | |
| undaunted(adjective, vigorous, steady, noble) | |
| unmoving(adjective, calm, secure, severe) | |
| valiant(adjective, vigorous, noble, bold) | |
| virile(adjective, tough, fit, vigorous) | |
| vital(adjective, complete, fit, solid) | |
| active(adjective, sound, tough, fit) | |
| assured(clear, certain, definite, sure) | |
| braced(adjective, secure, stable, unmoving) |
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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> |