275 entries under solid topic. ×
| creaky(adjective, hard, stiff, rigid) | |
| curdled(adjective, close, set, fix) | |
| deep(adjective, set, clear, tough, severe) | |
| entire(adjective, complete, total, certain) | |
| equable(adjective, calm, strong, secure) | |
| fit(adjective, strong, complete, tough) | |
| flourishing(strong, tough, fit, fresh) | |
| gloppy(adjective, set, heavy, deep) | |
| graceless(adjective, hard, stiff, rigid) | |
| gummous(adjective, set, heavy, deep) | |
| gunky(adjective, set, heavy, deep) | |
| hefty(adjective, strong, hard, sound, tough) | |
| high-principled(adjective, good, strong, honest) | |
| honest(adjective, close, strong, correct) | |
| honorable(adjective, close, strong, correct, honest) | |
| immalleable(adjective, hard, stiff, rigid) | |
| jellied(adjective, set, heavy, strengthen) | |
| levelheaded(adjective, stable, fixed, sturdy) | |
| lusty(strong, tough, fit, fresh) | |
| mechanical(adjective, hard, stiff, rigid) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 23 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |