- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
443 entries under adjective topic. ×
| steep(severe, stringent, drastic) | |
| tart | |
| taut | |
| taxing | |
| toilsome(hard, tough, severe, rough) | |
| trying | |
| tyrannical(hard, tough, harsh, cruel) | |
| ultra-fine(feature, slight, difference, subtle) | |
| uphill(hard, tough, severe, rough) | |
| veracious(correct, right, appropriate, honest) | |
| abstemious | |
| abstinent | |
| antagonistic(tough, severe, harsh, grim) | |
| censorious | |
| chilly | |
| choosy(thoughtful, precise, sober, prudent) | |
| cold(tough, severe, harsh, cruel) | |
| concrete(correct, solid, exact, proper) | |
| cool(severe, thoughtful, sober, cautious) | |
| crocked |
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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> |