65 entries under sound topic. ×
| well-established(right, proper, true, straight) | |
| attested(good, right, reasonable, rational) | |
| cogent(reasonable, rational, valid, lawful) | |
| compelling(reasonable, rational) | |
| convincing(reasonable, pure, rational, original) | |
| defensible(reasonable, rational) | |
| determinative(reasonable, rational) | |
| efficacious(good, right, reasonable, rational) | |
| in force(expression, good, right, reasonable) | |
| logical(good, right, reasonable, rational) | |
| persuasive(good, right, reasonable, rational) | |
| proven(reasonable, rational, accepted, permitted) | |
| rational | |
| reasonable(rational, valid, lawful, rightful) | |
| solid(good, right, reasonable, rational) | |
| stringent(good, right, reasonable, rational) | |
| strong(good, right, reasonable, rational) | |
| telling(reasonable, rational) | |
| tested(good, right, reasonable, rational) | |
| ultimate(reasonable, rational) |
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| APA | Smart Define. (2015). official thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/official/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "official thesaurus" https://smartdefine.org/official/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, official thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/official/thesaurus/synonyms>. |
| MLA | Smart Define. "official thesaurus" 13 April 2015. Web. 29 September 2026. <https://smartdefine.org/official/thesaurus/synonyms> |