891 entries under adjective topic. ×
| rigorous(strong, hard, complete, tough) | |
| standing pat(determined, resolute, obstinate, uncompromising) | |
| unflagging(strong, tough, fit, solid) | |
| vigorous(strong, tough, fit, solid) | |
| bold(strong, vigorous, noble, resolute) | |
| contrary(determined, resolute, persistent, obstinate) | |
| direct(clear, plain, certain, definite) | |
| forceful(clear, strong, sound, heavy) | |
| grim(strong, hard, tough, severe) | |
| harsh(mean, strong, hard, tough) | |
| headstrong(hard, tough, rough, harsh) | |
| hidebound(moderate, determined, resolute, cautious) | |
| impervious(set, strong, hard, tough) | |
| pat(solid, determined, usual, steady) | |
| powerful(strong, sound, tough, fit) | |
| recalcitrant(tough, persistent, obstinate, stubborn) | |
| snug | |
| stated(characteristic, certain, determined, usual) | |
| trusty(good, close, strong, correct) | |
| unbreakable(strong, hard, tough, severe) |
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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> |