- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
87 entries under rigid topic. ×
| tough(adjective, strong, hard, severe, rough) | |
| tight(adjective, severe, careful, strict) | |
| oppressive(adjective, hard, tough, severe, rough) | |
| painstaking(adjective, harsh, honorable, reliable) | |
| rough(adjective, strong, hard, tough, severe) | |
| unbending(adjective, strong, hard, tough, severe) | |
| critical(adjective, severe, harsh, precise) | |
| dour(adjective, tough, severe, firm, harsh) | |
| finicky(adjective, harsh, thoughtful, precise, sober) | |
| firm(noun, adjective, strong, hard, complete) | |
| obstinate(adjective, hard, severe, resolute) | |
| adamant(adjective, strong, hard, tough, harsh) | |
| burdensome(adjective, hard, severe, rough, difficult) | |
| fussy(adjective, harsh, thoughtful, sober) | |
| onerous(adjective, hard, severe, rough, difficult) | |
| unrelenting(adjective, strong, hard, tough, severe) | |
| Draconian(adjective, tough, severe, firm, harsh) | |
| immovable(adjective, set, strong, hard, tough) | |
| puritanical(adjective, tough, severe, firm, harsh) | |
| unchangeable(adjective, hard, resolute, inflexible) |
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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> |