280 entries under tough topic. ×
| stiff(adjective, feature, state, characteristic) | |
| firm(noun, adjective, adverb, feature, state) | |
| strong(adjective, person, body, strength) | |
| difficult(adjective, dull, great, easy) | |
| rigid(adjective, feature, state, characteristic, mean) | |
| severe(adjective, nature, mean, strong) | |
| unyielding(adjective, mean, strong, easy) | |
| cruel(adjective, person, mean, strong, cool) | |
| arduous(adjective, dull, great, easy) | |
| harsh(adjective, mean, strong, cool) | |
| laborious(adjective, dull, great, easy) | |
| substantial(adjective, strain, difficult, solid) | |
| robust(adjective, person, body, strong, strength) | |
| refractory(adjective, strain, rough, firm) | |
| rough(adjective, strong, great, severe) | |
| inflexible(adjective, characteristic, mean, strong) | |
| stubborn(adjective, characteristic, quality, mean, strong) | |
| toilsome(adjective, great, difficulty, difficult) | |
| rugged(adjective, strong, severe, continue) | |
| grievous(adjective, severe, rough, difficult) |
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| APA | Smart Define. (2016). hard thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/hard/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "hard thesaurus" https://smartdefine.org/hard/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, hard thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/hard/thesaurus/synonyms>. |
| MLA | Smart Define. "hard thesaurus" 24 March 2016. Web. 27 September 2026. <https://smartdefine.org/hard/thesaurus/synonyms> |