- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
189 entries under severe topic. ×
| stiff-necked(adjective, strong, hard, tough) | |
| troublesome(adjective, hard, tough, rough) | |
| unconscionable(adjective, stringent, drastic) | |
| unfeeling(adjective, tough, harsh, cruel) | |
| unsympathetic(adjective, tough, harsh, grim) | |
| abrupt | |
| acerbic | |
| backbreaking(adjective, hard, tough, rough) | |
| bad(adjective, unpleasant, vicious, extreme) | |
| basic | |
| blunt | |
| brusque | |
| bullheaded(adjective, strong, hard, tough) | |
| by the book(expression, adjective, idiom, strong, hard) | |
| curt | |
| dead set(expression, adjective, tough, firm) | |
| dead set on(expression, adjective, idiom, harsh) | |
| disagreeable(adjective, tough, harsh, unpleasant) | |
| disciplinary(adjective, strong, hard, tough) | |
| distressing(adjective, tough, rough, difficult) |
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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> |