- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
171 entries under tough topic. ×
| mortified(adjective, strong, hard, severe) | |
| mulish(adjective, strong, hard, severe) | |
| murder(adjective, hard, severe, rough) | |
| sanguinary(adjective, hard, harsh, cruel) | |
| scabrous(adjective, rough, difficult, heavy) | |
| serious(adjective, strong, hard, severe) | |
| set(adjective, hard, severe, firm) | |
| shameless(adjective, hard, harsh, cruel) | |
| slavish(adjective, rough, difficult, heavy) | |
| sour(adjective, hard, harsh, cruel) | |
| stickling(adjective, severe, firm, harsh) | |
| sticky(adjective, rough, difficult, heavy) | |
| straight(adjective, correct, severe, firm) | |
| stuffy(adjective, severe, firm, harsh) | |
| terrible(adjective, rough, difficult, intense) | |
| tiring(adjective, hard, severe, rough) | |
| toilful(adjective, rough, difficult, heavy) | |
| uncontrite(adjective, hard, harsh, cruel) | |
| unforgiving(adjective, hard, severe, harsh) | |
| unmerciful(adjective, hard, harsh, cruel) |
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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> |