- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
189 entries under severe topic. ×
| dogmatic(adjective, exact) | |
| dry | |
| dyed-in-the-wool(adjective, set, strong, hard, tough) | |
| fatiguing(adjective, hard, tough, rough) | |
| forbidding(adjective, strong, hard, tough) | |
| frosty | |
| frowning(adjective, strong, hard, tough) | |
| fundamental | |
| grievous(adjective, hard, tough, harsh) | |
| grueling(adjective, hard, tough, difficult) | |
| hard-boiled(adjective, strong, hard, tough) | |
| hard-line(adjective, strong, hard, tough) | |
| hardheaded(adjective, strong, hard, tough) | |
| imperial | |
| irksome(adjective, tough, rough, difficult) | |
| iron-fisted(adjective, tough, firm, harsh) | |
| lean | |
| mortified(adjective, strong, hard, tough) | |
| mulish(adjective, strong, hard, tough) | |
| murder(adjective, hard, tough, rough) |
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| APA | Smart Define. (2016). rigorous thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, rigorous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>. |
| MLA | Smart Define. "rigorous thesaurus" 26 February 2016. Web. 23 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms> |