138 entries under sturdy topic. ×
| potent(adjective, clear, strong, sound, severe) | |
| reliable(adjective, calm, strong, secure, firm) | |
| resilient(adjective, strong, flexible, robust) | |
| thick(adjective, person, set, body, strong) | |
| hard as nails(expression, adjective, idiom, strong, hard) | |
| hardheaded(adjective, strong, hard, determined, unreasonable) | |
| immovable(adjective, mean, strong, hard, determined) | |
| lasting(adjective, calm, strong, solid, steady) | |
| mulish(adjective, mean, strong, hard, firm) | |
| permanent(adjective, calm, strong, solid, steady) | |
| forbidding(adjective, strong, hard, severe, firm) | |
| forceful(adjective, clear, strong, sound, severe) | |
| forcible(adjective, strong, sound, energetic, heavy) | |
| hard-wearing(adjective, strong, robust, rambling) | |
| impervious(noun, adjective, set, strong, hard) | |
| insensible(adjective, strong, hard, severe, careless) | |
| abiding(calm, strong, solid, steady, substantial) | |
| active(adjective, strong, sound, fit, difficult) | |
| astringent(adjective, strong, hard, severe, harsh) | |
| crude(adjective, strong, hard, rude) |
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| APA | Smart Define. (2016). tough thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/tough/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "tough thesaurus" https://smartdefine.org/tough/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2016, tough thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/tough/thesaurus/synonyms>. |
| MLA | Smart Define. "tough thesaurus" 30 March 2016. Web. 29 September 2026. <https://smartdefine.org/tough/thesaurus/synonyms> |