- Definitions|0
- Thesaurus|281
- Abbreviations|1
55 entries under severe topic. ×
| rigid(adjective, strong, hard, tough) | |
| rigorous(adjective, strong, hard, tough) | |
| rough(adjective, strong, hard, tough) | |
| serious(adjective, strong, hard, tough) | |
| steely(adjective, strong, hard, tough) | |
| stiff(adjective, harsh, rigid, tight) | |
| stiff-necked(adjective, strong, hard, tough) | |
| strict(adjective, strong, hard, tough) | |
| tough(adjective, strong, hard, harsh) | |
| unrelenting(adjective, strong, hard, tough) | |
| valid(adjective, harsh, stiff, rigid) | |
| firm(adjective, strong, hard, tough) | |
| forceful(adjective, stiff, tight, strict) | |
| tight(adjective, stiff, rigid, strict) | |
| unyielding(adjective, strong, hard, tough) |
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| APA | Smart Define. (2013). by the book thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/by_the_book/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "by the book thesaurus" https://smartdefine.org/by_the_book/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2013, by the book thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/by_the_book/thesaurus/synonyms>. |
| MLA | Smart Define. "by the book thesaurus" 19 May 2013. Web. 30 September 2026. <https://smartdefine.org/by_the_book/thesaurus/synonyms> |