275 entries under solid topic. ×
| compressed(adjective, set, hard, heavy) | |
| concentrated(adjective, set, strong, hard) | |
| condensed(adjective, set, hard, heavy) | |
| hardy(noun, adjective, strong, sound, tough) | |
| heavy(adjective, set, strong, hard, sound) | |
| indefatigable(adjective, strong, tough, fit) | |
| rugged(adjective, set, strong, hard, sound) | |
| indurate(verb, adjective, close, set, fix) | |
| unflagging(adjective, strong, tough, fit) | |
| vigorous(adjective, strong, tough, fit) | |
| harden(verb, close, set, settle) | |
| impervious(adjective, set, strong, hard, tough) | |
| pat(adjective, determined, usual, steady) | |
| powerful(adjective, strong, sound, tough, fit) | |
| trusty(adjective, good, close, strong, correct) | |
| unbreakable(adjective, strong, hard, tough, severe) | |
| absolute(adjective, clear, strong, complete, easy) | |
| balanced(adjective, calm, strong, secure, easy) | |
| consolidated(adjective, close, set, hard) | |
| hardened(adjective, set, strong, hard, tough) |
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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> |