94 entries under tough topic. ×
| resolute(adjective, calm, strong, secure) | |
| strapping(adjective, person, body, strong, sound) | |
| stubborn(adjective, strong, secure, firm) | |
| able-bodied(adjective, person, body, strong, sound) | |
| athletic(adjective, person, body, strong, sound) | |
| enduring(adjective, calm, strong, sound) | |
| hardened(adjective, set, strong, hard) | |
| inelastic(adjective, hard, severe, firm) | |
| obstinate(adjective, strong, firm, determined) | |
| unswerving(adjective, strong, complete, smooth) | |
| active(adjective, strong, sound, heavy) | |
| fit(adjective, strong, hard, sound, complete) | |
| forcible(adjective, clear, strong, sound) | |
| heavy-duty(adjective, strong, sound, heavy) | |
| iron(adjective, set, strong, hard) | |
| reinforced(adjective, strong, sound, heavy) | |
| sinewy(adjective, strong, hard, sound) | |
| tenacious(adjective, strong, sound, secure) | |
| well(adjective, adverb, strong, complete) | |
| hard as nails(expression, adjective, idiom, set, strong) |
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| APA | Smart Define. (2016). solid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/solid/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, solid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>. |
| MLA | Smart Define. "solid thesaurus" 29 March 2016. Web. 25 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms> |