198 entries under hard topic. ×
| determined(adjective, good, tough, easy) | |
| stubborn(adjective, tough, firm, violent) | |
| harsh(adjective, great, tough, severe) | |
| extreme(adjective, great, severe, sharp) | |
| fixed(adjective, sound, secure, tough) | |
| concentrated(adjective, set, tough, firm) | |
| close(adjective, great, sharp, firm) | |
| dense(adjective, person, set, body) | |
| indomitable(adjective, great, tough, firm) | |
| iron(adjective, power, tough, firm) | |
| rough(adjective, tough, intense, violent) | |
| unshakable(adjective, strong, secure, tough) | |
| bitter(adjective, tough, sharp, intense) | |
| leathery(adjective, solid, stiff, sturdy) | |
| serious(adjective, tough, firm, solid) | |
| spirituous(adjective, alcohol, ingestion) | |
| strict(adjective, tough, severe, flat) | |
| thick(adjective, person, body, tough) | |
| adamantine(adjective, set, tough, firm) | |
| authoritarian(adjective, tough, energetic, powerful) |
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| APA | Smart Define. (2016). strong thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/strong/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "strong thesaurus" https://smartdefine.org/strong/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, strong thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/strong/thesaurus/synonyms>. |
| MLA | Smart Define. "strong thesaurus" 1 April 2016. Web. 24 September 2026. <https://smartdefine.org/strong/thesaurus/synonyms> |