- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
87 entries under rigid topic. ×
| steadfast(adjective, hard, resolute, inflexible) | |
| unadaptable(adjective, hard, resolute, inflexible) | |
| by the book(expression, adjective, idiom, strong, hard) | |
| dead set(expression, adjective, tough, severe, firm) | |
| disciplinary(adjective, strong, hard, tough, severe) | |
| dyed-in-the-wool(adjective, set, strong, hard, tough) | |
| forbidding(adjective, strong, hard, tough, severe) | |
| grievous(adjective, hard, tough, severe, harsh) | |
| hard-boiled(adjective, strong, hard, tough, severe) | |
| iron-fisted(adjective, tough, severe, firm, harsh) | |
| powerful(adjective, severe, harsh, tight) | |
| resolved | |
| set(adjective, hard, tough, severe, firm) | |
| steady | |
| stickling(adjective, tough, severe, firm, harsh) | |
| straight(adjective, tough, correct, severe, firm) | |
| stuffy(adjective, tough, severe, firm, harsh) | |
| tense | |
| uncompliant(adjective, hard, resolute, inflexible) | |
| unpermissive(adjective, hard, tough, severe, rough) |
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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> |