94 entries under tough topic. ×
| rugged(adjective, set, strong, sound) | |
| stalwart(adjective, calm, person, body, strong) | |
| well-founded(adjective, calm, good, strong, sound) | |
| heavy(adjective, characteristic, person, set, body) | |
| close(adjective, set, hard, correct) | |
| durable(adjective, calm, strong, sound) | |
| fast(verb, adjective, adverb, calm, strong) | |
| impenetrable(adjective, close, set, hard) | |
| powerful(adjective, good, person, clear, body) | |
| staunch(noun, adjective, calm, good, strong) | |
| tight(adjective, adverb, good, close, strong) | |
| compressed(adjective, set, hard, firm) | |
| concentrated(adjective, set, hard, complete) | |
| robust(adjective, person, body, strong, sound) | |
| set(adjective, calm, strong, hard, secure) | |
| true(adjective, good, strong, sound, smooth) | |
| unyielding(adjective, set, strong, hard, sound) | |
| well-built(adjective, calm, person, body, strong) | |
| hefty(adjective, person, body, strong, hard) | |
| vigorous(adjective, strong, sound, complete) |
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| APA | Smart Define. (2016). solid thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/solid/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, solid thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>. |
| MLA | Smart Define. "solid thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms> |