- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
171 entries under tough topic. ×
| intemperate(adjective, hard, severe, rough) | |
| prudish(adjective, severe, firm, harsh) | |
| steely(adjective, set, strong, hard) | |
| strait-laced(adjective, severe, firm, harsh) | |
| strenuous(adjective, hard, severe, rough) | |
| strong(adjective, hard, severe, sturdy) | |
| stubborn(adjective, strong, hard, severe) | |
| authoritarian(adjective, strong, hard, severe) | |
| effortful(adjective, rough, difficult, harsh) | |
| fierce(adjective, hard, harsh, intense) | |
| formidable(adjective, hard, severe, rough) | |
| hard-hearted(adjective, hard, harsh, cruel) | |
| heavy(adjective, strong, hard, severe) | |
| implacable(adjective, strong, hard, harsh) | |
| intricate(adjective, rough, difficult, heavy) | |
| mean(adjective, severe, rough, difficult) | |
| murderous(adjective, hard, harsh, cruel) | |
| painful(adjective, hard, severe, difficult) | |
| pitiless(adjective, hard, severe, harsh) | |
| ruthless(adjective, hard, harsh, unpleasant) |
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| APA | Smart Define. (2016). rigorous thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, rigorous thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>. |
| MLA | Smart Define. "rigorous thesaurus" 26 February 2016. Web. 27 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms> |