338 entries under strong topic. ×
| bulky(hard, solid, deep, large) | |
| calm(verb, adjective, fix, secure) | |
| close-fitting(adjective, close, stiff, tight) | |
| continuing(adjective, wild, determined, familiar) | |
| even(adjective, calm, secure, solid) | |
| formidable | |
| game(noun, adjective, bold, resolute) | |
| hard-boiled(adjective, mean, hard, tough) | |
| hard-core(adjective, close, hard, tough) | |
| hard-shell(adjective, hard, tough, severe) | |
| heroic(vigorous, noble, bold, resolute) | |
| in the bag(expression, adjective, idiom, clear) | |
| incompressible(adjective, resist) | |
| indurated(adjective, set, hard, stiff) | |
| locked(adjective, sound, secure, fast) | |
| meaningful(adjective, severe, solid, important) | |
| mounted(adjective, secure, stable, unmoving) | |
| on ice(expression, adjective, clear, easy) | |
| persisting(adjective, tough, determined, steady) | |
| predictable(good, solid, steady, consistent) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 27 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |