- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
189 entries under severe topic. ×
| great(adjective, stringent, drastic) | |
| grinding(adjective, tough, rough, difficult) | |
| gruff | |
| hairy(adjective, tough, rough, difficult) | |
| hard-core(adjective, strong, hard, tough) | |
| hard-nosed(adjective, strong, hard, tough) | |
| hard-shell(adjective, strong, hard, tough) | |
| hostile(adjective, tough, harsh, grim) | |
| immoderate(adjective, stringent, drastic) | |
| intolerable(adjective, tough, harsh, heavy) | |
| intolerant(adjective, hard, tough, firm) | |
| intransigent(stiff, inflexible, strict, obstinate) | |
| ironhanded(adjective, exact) | |
| knotty(adjective, tough, rough, difficult) | |
| operose(adjective, hard, tough, rough) | |
| picky(adjective, tough, fine, firm) | |
| poignant(adjective, harsh, unpleasant, vicious) | |
| short | |
| solid(adjective, complete, correct, harsh) | |
| square(adjective, tough, firm, harsh) |
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| APA | Smart Define. (2016). rigorous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, rigorous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>. |
| MLA | Smart Define. "rigorous thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms> |