- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
443 entries under adjective topic. ×
| hidebound(severe, obstinate, stubborn, unbending) | |
| icy | |
| immutable(hard, resolute, rigid, inflexible) | |
| intemperate(hard, tough, severe, rough) | |
| mathematical | |
| narrow | |
| prudish(tough, severe, firm, harsh) | |
| religious(thoughtful, sober, cautious, prudent) | |
| resolute(hard, intense, rigid, inflexible) | |
| steely(set, strong, hard, tough) | |
| strait-laced(tough, severe, firm, harsh) | |
| strenuous(hard, tough, severe, rough) | |
| strong(hard, tough, severe, sturdy) | |
| stubborn(strong, hard, tough, severe) | |
| violent | |
| authoritarian(strong, hard, tough, severe) | |
| caustic | |
| cautious(wary, watchful) | |
| compressed | |
| controlled |
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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> |