891 entries under adjective topic. ×
| fastened(strong, sound, secure, short) | |
| flat(change, certain, definite, resolved) | |
| hardy(noun, strong, sound, tough) | |
| heavy(set, strong, hard, sound) | |
| indefatigable(strong, tough, fit, solid) | |
| purposeful(strong, tough, determined, serious) | |
| rugged(set, strong, hard, sound) | |
| specific(clear, certain, definite, sure) | |
| strong-minded(certain, determined, significant, resolution) | |
| unswayable(determined, resolute, rigid, obstinate) | |
| assertive | |
| bent(set, intense, certain, deliberate) | |
| bound(set, strong, tough, intense) | |
| brave(clear, tough, severe, determined) | |
| callous(verb, close, set, fix) | |
| crisp(dry, brittle) | |
| hanging tough(expression, mean, hard, determined) | |
| indurate(verb, close, set, fix) | |
| intractable(tough, persistent, rigid, inflexible) | |
| mulish(mean, strong, hard, tough) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 25 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |