1,055 entry under adjective topic. ×
| complicated(hard, difficult, complex) | |
| intricate(hard, difficult, complex, laborious) | |
| operose(hard, severe, difficulty, rough) | |
| problematic(hard, difficult, complex) | |
| impenetrable(hard, firm, solid, stiff) | |
| stiff(strong, hard, severe, rough) | |
| uncompromising(characteristic, mean, clear, hard) | |
| durable(calm, quality, strong, sound) | |
| tricky(hard, difficult, complex) | |
| fierce(noun, clear, bad, hard) | |
| punishing(hard, difficult, complex) | |
| sad(bad, hard, cool, severe) | |
| demanding(dull, hard, easy, severe) | |
| robust(person, body, strong, hard) | |
| stony(mean, hard, cool, severe) | |
| callous(noun, mean, hard, cool) | |
| stern(hard, easy, severe, rough) | |
| stodgy(hard, difficult, complex) | |
| viscous(feature, characteristic, structure, sticky) | |
| adamant(mean, strong, hard, rough) |
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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> |