338 entries under strong topic. ×
| rocky(adjective, set, hard, difficult) | |
| trustworthy(adjective, good, close, clear) | |
| unfailing(adjective, good, set, clear) | |
| well-built(adjective, calm, sound, heavy) | |
| well-founded(adjective, calm, sound, certain) | |
| austere(adjective, hard, tough, severe) | |
| bolted(adjective, secure, fast, short) | |
| cemented(adjective, set, hard, secure) | |
| closed(adjective, secure, stable, unmoving) | |
| compacted(adjective, set, hard, solid) | |
| defiant(adjective, bold, persistent, spirited) | |
| embedded(adjective, secure, stable, unmoving) | |
| energetic | |
| fearless(adjective, vigorous, noble, bold) | |
| healthy(adjective, sound, complete, tough) | |
| hearty(adjective, sound, complete, tough) | |
| mettlesome(adjective, courageous, fearless, plucky) | |
| mighty(adjective, sound, fit, heavy) | |
| motionless(adjective, calm, secure, moving) | |
| packed(adjective, close, set, hard) |
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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> |