367 entries under hard topic. ×
| sturdy(adjective, calm, person, quality, body) | |
| firm(adjective, calm, mean, clear, strong) | |
| flinty(adjective, strong, firm, harsh) | |
| cruel(adjective, mean, strong, cool) | |
| thorny(adjective, difficult, complex, problematic) | |
| adamantine(adjective, strong, firm, unreasonable) | |
| tight(adjective, strong, difficult, complex) | |
| inflexible(adjective, characteristic, mean, strong) | |
| hefty(adjective, person, dull, body, strong) | |
| rigid(adjective, characteristic, mean, strong) | |
| grievous(adjective, severe, difficult, harsh) | |
| painful(adjective, bad, severe, difficult) | |
| serious(adjective, bad, strong, easy) | |
| weighty(adjective, difficult, heavy, complex) | |
| backbreaking(adjective, difficult, heavy, complex) | |
| complex(adjective, difficult) | |
| complicated(adjective, difficult, complex) | |
| intricate(adjective, difficult, complex, laborious) | |
| operose(adjective, severe, difficulty, rough) | |
| problematic(adjective, difficult, complex) |
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| APA | Smart Define. (2016). tough thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/tough/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "tough thesaurus" https://smartdefine.org/tough/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, tough thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/tough/thesaurus/synonyms>. |
| MLA | Smart Define. "tough thesaurus" 30 March 2016. Web. 27 September 2026. <https://smartdefine.org/tough/thesaurus/synonyms> |