192 entries under sound topic. ×
| prosaic(hard, straightforward, realistic, down-to-earth) | |
| proven(reasonable, logical, understandable) | |
| pure | |
| stringent | |
| substantial(adjective, reasonable, legitimate, well-founded) | |
| tested | |
| ultimate | |
| unadulterated | |
| unanswerable | |
| uncorrupted(adjective, reasonable, just, open-minded) | |
| vindicable | |
| warrantable |
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| APA | Smart Define. (2016). rational thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/rational/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "rational thesaurus" https://smartdefine.org/rational/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, rational thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/rational/thesaurus/synonyms>. |
| MLA | Smart Define. "rational thesaurus" 29 March 2016. Web. 28 September 2026. <https://smartdefine.org/rational/thesaurus/synonyms> |