210 entries under determined topic. ×
| untiring(adjective, persevering) | |
| committed(adjective, strong, steady, fixed) | |
| courageous(adjective, strong, vigorous, noble) | |
| die-hard(adjective, moderate, honest, resolute) | |
| hardened(adjective, set, strong, hard, tough) | |
| incompliant(adjective, tough, solid, stiff) | |
| never-failing(adjective, complete, total, solid, certain) | |
| unfailing(adjective, good, set, clear, strong) | |
| deliberate(adjective, intense, resolute, decisive) | |
| hell-bent(adjective, fixed, resolute, persistent) | |
| potent(adjective, clear, strong, sound, tough) | |
| serious(adjective, strong, hard, tough, severe) | |
| spunky(adjective, strong, bold, resolute) | |
| stiff-necked(adjective, mean, strong, hard, tough) | |
| stipulated(adjective, certain, usual, limited) | |
| uncompliant(adjective, tough, resolute, stubborn) | |
| brawny(adjective, strong, fit, healthy) | |
| bullheaded(adjective, strong, hard, tough) | |
| customary(adjective, usual, regular, planned) | |
| dead set(expression, adjective, tough, severe, harsh) |
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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> |