- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
189 entries under severe topic. ×
| acute | |
| adamantine(adjective, set, strong, hard, tough) | |
| bleak(adjective, tough, harsh, cruel) | |
| brisk(adjective, stringent, drastic) | |
| crisp | |
| determined(adjective, harsh, solid, intense) | |
| disciplined | |
| exhausting(adjective, hard, tough, rough) | |
| flinty(adjective, strong, hard, tough) | |
| hidebound(adjective, obstinate, stubborn, unbending) | |
| icy | |
| intemperate(adjective, hard, tough, rough) | |
| prudish(adjective, tough, firm, harsh) | |
| steely(adjective, set, strong, hard, tough) | |
| strait-laced(adjective, tough, firm, harsh) | |
| strenuous(adjective, hard, tough, rough) | |
| strong(adjective, hard, tough, sturdy) | |
| stubborn(adjective, strong, hard, tough) | |
| authoritarian(adjective, strong, hard, tough) | |
| caustic |
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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> |