- Definitions|0
- Thesaurus|281
- Abbreviations|1
32 entries under rigorous topic. ×
| powerful(adjective, severe, harsh, stiff, rigid) | |
| rigid(adjective, strong, hard, tough, severe) | |
| rough(adjective, strong, hard, tough, severe) | |
| severe(adjective, strong, hard, tough, harsh) | |
| stiff(adjective, severe, harsh, rigid, tight) | |
| strict(adjective, strong, hard, tough, severe) | |
| tough(adjective, strong, hard, severe, harsh) | |
| unsparing(adjective, strong, hard, tough, harsh) | |
| valid(adjective, severe, harsh, stiff, rigid) | |
| forceful(adjective, severe, stiff, tight, strict) | |
| nit-picking(adjective, harsh, rigid, strict, thorough) | |
| tight(adjective, severe, stiff, rigid, strict) |
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| APA | Smart Define. (2013). by the book thesaurus. Retrieved September 29, 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 29, 2026). |
| Harvard | Smart Define 2013, by the book thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/by_the_book/thesaurus/synonyms>. |
| MLA | Smart Define. "by the book thesaurus" 19 May 2013. Web. 29 September 2026. <https://smartdefine.org/by_the_book/thesaurus/synonyms> |