- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
171 entries under tough topic. ×
| toilsome(adjective, hard, severe, rough) | |
| tyrannical(adjective, hard, harsh, cruel) | |
| uphill(adjective, hard, severe, rough) | |
| antagonistic(adjective, severe, harsh, grim) | |
| cold(adjective, severe, harsh, cruel) | |
| difficile(adjective, rough, difficult, heavy) | |
| grinding(adjective, severe, rough, difficult) | |
| hairy(adjective, severe, rough, difficult) | |
| hard-core(adjective, strong, hard, severe) | |
| hard-nosed(adjective, strong, hard, severe) | |
| hard-shell(adjective, strong, hard, severe) | |
| hostile(adjective, severe, harsh, grim) | |
| inhuman(adjective, hard, harsh, cruel) | |
| intolerable(adjective, severe, harsh, heavy) | |
| intolerant(adjective, hard, severe, firm) | |
| knotty(adjective, severe, rough, difficult) | |
| merciless(adjective, hard, difficult, harsh) | |
| operose(adjective, hard, severe, rough) | |
| picky(adjective, severe, fine, firm) | |
| rancorous(adjective, harsh, grim, painful) |
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| APA | Smart Define. (2016). rigorous thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, rigorous thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>. |
| MLA | Smart Define. "rigorous thesaurus" 26 February 2016. Web. 26 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms> |